Dermoscopy of inflammatory skin diseases
- 1 Psoriasis
- 2 Dermatitis
- 3 Lichen planus
- 4 Pityriasis rosea
- 5 Pityriasis rubra pilaris
- 6 Porokeratosis
- 7 Granulomatous skin diseases
- 8 Discoid lupus erythematosus
- 9 Rosacea
- 10 Lichen sclerosus and morphea
- 11 Urticaria and urticarial vasculitis
- 12 Pigmented purpuric dermatoses
- 13 Darier’s disease
- 14 Mastocytosis
- 15 Vasculitides
- 16 Mycosis fungoides
The basic principles of applying dermoscopyDermoscopy is a non invasive diagnostic method. in inflammatory diseases are the following: 1. Interpretation of dermoscopic findings should be always context-driven. The diagnosisis the identification of the nature and cause of a certain phenomenon. Diagnosis is used in many different disciplines with variations in the use of logic, analytics, and experience to determine "cause and effect". In systems engineering and computer science, it is typically used to determine the causes of symptoms, mitigations, and solutions in dermatology is usually established on the basis of the clinical morphologyThis glossary term has not yet been described. and distribution of the skin eruption. Sometimes, the clinical manifestations do not allow the establishment of a definite diagnosis and more than 1 diseases are included in the differential diagnosis. Applying dermoscopy and interpreting dermoscopic findings makes sense only within this specific differential diagnosis that has been established clinically.
2. The main parameters that have to be evaluated when applying dermoscopy in general dermatology are the following: i) VesselsThis glossary term has not yet been described. morphology ii) Vessels distribution iii) Scale colorColor (American English) or colour (Commonwealth English) is the characteristic of human visual perception described through color categories, with names such as red, yellow, purple, or blue. iv) Scale distribution v) Follicular criteriameasure of how well one variable or set of variables predicts an outcome vi) Pigmented structures vii) Specific cluesEvidence, in an investigation
3.The selection of equipmentphysical item that can be used to achieve a goal, especially if the item is not consumed in the process that preserves vesselsThis glossary term has not yet been described.’ morphology is essential because vascular structuresThis glossary term has not yet been described. represent the most important group of criteria in diagnosing inflammatory skin diseases. Evaluation of vascular structures should be performed with a second-generation hand-held dermatoscopeThis traditionally consists of a magnifier (typically x10), a non-polarised light source, a transparent plate and a liquid medium between the instrument and the skin, and allows inspection of skin lesions unobstructed by skin surface reflections. Modern dermatoscopes dispense with the use of liquid medium and instead use polarised light to cancel out skin surface reflections. using polarized lightThis glossary term has not yet been described.. If only a standard dermatoscope requiring direct contact is available, ultrasound gel and an examination with only applying minimal pressure may prevent the alteration or disappearance of vascular structures. Similar if acquiring a dermoscopic image, it is preferable to use new-generation dermatoscopes instead of contact-dermatoscopes for inflammatory lesions.
Dotted vesselstiny pinpoint vessels flat melanocytic lesions inflammatory diseases Bowen disease represent the most frequent dermoscopic feature of Psoriasis, being present in every single psoriatic plaque. Detection of any other morphologic type of vessels excludes the diagnosis of PP. The term “red globulesThis glossary term has not yet been described.” has also been used to describe the same dermoscopic feature.  Distinction between dots and globules is based on the diameter of the structure (dots are smaller), and it is important in dermoscopy of melanocyticThis glossary term has not yet been described. tumors. In psoriasisThis glossary term has not yet been described., both terms may be used, since the roundish vascular structures can be of various diameters, although they are usually of similar size within a given lesion. Under higher magnifications (x100-x400), the psoriatic vessels appear as dilated, elongated, and convoluted capillaries. Histopathologically, red dots correspond to the loops of vertically arranged vessels within the elongated dermal papillae. Important for differential diagnosis, the uniform distribution of the red dots within the lesion represents the dermoscopic hallmark of psoriasis. Dotted vessels may be detected in several inflammatory dermatoses, but no other disease exhibits the symmetrical and homogenous arrangementThis glossary term has not yet been described. of vessels all over the lesion that characterizes psoriatic plaques, unless thick superficialThis glossary term has not yet been described. scales cover them. Scales removal will bring to light the characteristic vascular pattern of psoriasis, possibly together with tiny red blood drops, which can be characterized as the dermoscopic “Auspitz sign”. A specific feature for the diagnosis of psoriasis is the sign of red globular rings, described by Vazquez-Lopez et al. If present, the red globules are arranged in irregular circles or rings. But even if highly specific, this sign is only seen in a minority of psoriatic lesions. Other types of vessels distribution are extremely rare in psoriasis. In addition, light red background color and white superficial scales are two common dermoscopic criteria of plaque psoriasis. In differential diagnosis of erythematosquamous dermatoses, scale color is of particular value: Yellow scales are a negative predictor of plaque psoriasis, therefore argueing for the presence of dermatitisalso known as eczema is a group of diseases that results in inflammation of the skin.. Dermoscopic findings of psoriasis may vary dependent of the body sitedescribes the area of the body and the various amounts of scaling. In psoriatic balanitis and inverse psoriasis lesions that lack scaling, the regularly distributed red dots are prominent. Contrariwise, in scalp or palmoplantar psoriasis, thick hyperkeratotic plaques hide the typical vascular structures, which may be recognized after removal of the scales.
Dermoscopic transformation of psoriatic plaques under treatmentRegular dermoscopic examination is of avail in patients under treatment with topical steroids or systemic biological agents, because additional morphologic information might be helpful for early detection of a relapse. Additionally, steroid-induced skin atrophy is earlier detected by dermoscopy (by revealing characteristic linear vesselsLinear mildly curved vessels considered irregular when different sizes shapes and curves with a haphazard or random distribution are presented and considered regular when short and fine (thin) linear vessels prevail various diagnoses) than in the clinical setting.
Despite their variable etiopathologies, all forms of dermatitis show similar histopathologic just as similar dermoscopic characteristics. Dermatitis usually exhibits red dots in a patchy distribution and yellow scales. The red dots are identical to the vessels in psoriatic lesions, but unlike psoriasis, their distribution is not homogenous and regular, but rather clustered, generating an irregular, “patchy” pattern.SuperficialThis glossary term has not yet been described. scaling is a frequent characteristic of dermatitis, but opposed to psoriasis and other erythematosquamous skin diseases, the scales in dermoscopy of dermatitis reveal a yellow color either alone, or in combination with white.  Belonging to the group of the characteristic yellow scales, the “yellow clod sign” is frequently observed in nummular eczema. Notably, yellow scale color is dermoscopically detected not only in acute, but also in chronic dermatitis. Contact dermatitis, nummular eczema, generalized dermatitis, chronic dermatitis, seborrheic dermatitis and other subtypes were reported to reveal similar findings in dermoscopy, but further investigation on their specific pattern is needed.
White crossing streakslines radial (always at periphery) streaks Reed nevus melanoma recurrent nevus (Wickham striae) are the hallmark of lichen planus not only in clinical examination (particularly in mucous lesions), but also in dermoscopy. White crossing streaks are a specific, as well as a constant finding for lichen planusThis glossary term has not yet been described., irrespectively of lesion’s duration or subtype. Vessels of mixed morphology (dotted and linear) may be found at the periphery of the lesion.
Pityriasis roseaThe two major dermoscopic features of pityriasis rosea are yellowish background color and peripheral whitish scales. Besides, dotted vesselstiny pinpoint vessels flat melanocytic lesions inflammatory diseases Bowen disease may be detected in dermoscopy of most pytiriasis rosea lesions, as seen in psoriasis and dermatitis. However, the vascular pattern lacks the characteristic regular distribution of psoriasis.pityriasis rubra pilarisThis glossary term has not yet been described.. This observation suggests that pityriasis rubra pilaris shows no typical characteristics of psoriasis, which is the most common differential diagnosis. 
In porokeratosisThis glossary term has not yet been described., the cornoid lamella, known as the histopathologic hallmark of porokeratosis, is revealed by dermoscopic examination as a well-defined, white-yellowish peripheral annular structure (“white track”, ‘‘the outlines of a volcanic crater as observed from a high pointThis glossary term has not yet been described.’’). In disseminated superficial actinic porokeratosis, the peripheral track may be hyperpigmented. Depending on the disease subtype and the stage of progression, the central part of porokeratotic lesions can demonstrate a brownish pigmentation, dotted or linear vessels, or a structureless whitish area. By dermoscopy, the diagnosis of porokeratosis is performed without difficulty, even in clinically atypical cases.granulomatousThis glossary term has not yet been described. skin diseases. However, their differential diagnosis remains challenging due to identical dermoscopic presentation produced by several causes. Notably, the plaque form of cutaneous sarcoidosisThis glossary term has not yet been described. may resemble necrobiosis lipoidica. The longer and more branching telangiectasias of necrobiosis lipoidica, caused by atrophic changes not present in cutaneous sarcoidosis, were reported to be an important feature for discrimination from other granulomatous diseases.
SarcoidosisThis glossary term has not yet been described. and lupus vulgarisThis glossary term has not yet been described.
In sarcoidosis  and lupus vulgaris, orange-yellowish translucent globular-like or structureless areas in combination with linear vessels have been described, which are suggested to correspond to the underlying granulomas.
Cutaneous leishmaniasisIn cutaneous leishmaniasis, dermoscopy reveals generalized erythema, yellow tears (follicular plugs), hyperkeratosis and central erosion/ulceration. The characteristic translucent orange-yellowish color of sarcoidosis may additionally be present.helpRefers to giving assistance or support to others for mutual benefit clinicians rule out the latter conditions.
Necrobiosis lipoidicaNecrobiosis lipoidica exhibits a characteristic and repetitive pattern, typified by a prominent network of linear arborizing vesselsanalytic term is branched vessels; Bright red sharply in focus large or thick diameter vessels dividing into smaller vessels; BCC and a yellow background color. The prominent vascular network of necrobiosis lipoidica represent the most valuable feature for differential diagnosis from other granulomatous diseases. This typical vascular morphology should be differentiated from the classical ‘arborizing' vessels of nodularThis glossary term has not yet been described.-cystic basal cell carcinomais the most common skin cancer, and one of the most common cancers in the United States. While BCC has a very low metastatic risk, this tumor can cause significant disfigurement by invading surrounding tissues. Classical arborizing vessels usually reveal ramifications into finest capillaries, while vessels in necrobiosis lipoidica exhibit only few diameter variegations and reveal multiple anastomosing ramifications. Ulcerations and yellow crusts represent the most common additional features.
Discoid lupus erythematosusis a chronic skin condition of sores with inflammation and scarring favouring the face, ears, and scalp and at times on other body areas. These lesions develop as a red, inflamed patch with a scaling and crusty appearance. The centre areas may appear lighter in colour with a rim darker than the normal skin.Dermoscopic criterias differ depending on the stage of progression of discoid lupus erythematosusis a chronic skin condition of sores with inflammation and scarring favouring the face, ears, and scalp and at times on other body areas. These lesions develop as a red, inflamed patch with a scaling and crusty appearance. The centre areas may appear lighter in colour with a rim darker than the normal skin.. In early lesions, perifollicular whitish halo, follicular plugging and white scales are the predominant features, while in longer-standing lesions telangiectatic vessels, pigmentation structures and whitish structureless areas prevail. This distinct dermoscopic pattern is useful for discriminating discoid lupus erythematosus from lupus pernio (cutaneous sarcoidosis) and lupus vulgaris (cutaneous tuberculosis). The latter diseases lack the predominant follicular abnormalities of discoid lupus erythematosus, and display a characteristic pattern consisting of orange-yellowish areas/globules and branching arborizing vessels.
Rosacea is characterized by a unique dermoscopic vascular pattern of polygonal vessels. Since this pattern of dermoscopic vascular polygonslines angulated or polygonal (non-facial skin) is not present in any other skin disease, this is a sensitive criterion for the diagnosis of rosaceaThis glossary term has not yet been described.. Regarding the accuracy in evaluation of vascular alterations by dermoscopy, the technique may be additionally useful for follow up of rosacea. Additional dermoscopic findings of rosacea include follicular plugs, white scales, features related to the presence of demodex (“demodex tails”) and whitish amorphic follicular material. However, the frequency of these additional criteria is relatively low. In papulopustular rosacea, clinically non-visible pustules provide a useful dermoscopic clue for discrimination from lupus erythematosus, but this requires further investigation.
Lichen sclerosus and morphea
The predominant dermoscopic feature of lichen sclerosus are white-yellowish structureless areas, independently of the location. Genital lichen sclerosus commonly appear with linear vessels while extragenital lesions rather exhibit keratotic plugs, surrounded by an erythematous halo. This halo represents a marker of disease activity. In morphea, linear vessels within the lilac ring are a typical finding in dermoscopy.By dermoscopical examination, lichen sclerosus is typified by comedo-like openings[[Comedo like openings]] and whitish patches, whereas morphea exhibits fibrotic beams.
Common urticaria is dermoscopically characterized by a red, reticular network of linear vessels, which may be surrounded by an area devoid of vessels, corresponding to dermal edema. On the contrary, urticarial vasculitis dermoscopically exhibit purpuric dots or globules on an orange-brown background. Both diseases reveal no highly specific criteria, but the presence of purpuric dots is suggestive of an underlying vasculitis.
Pigmented purpuric dermatoses
The term pigmented purpuric dermatoses comprehends the following entities: Schamberg’s disease, Majocchi purpura, eczematoid purpura of Doucas and Kapetanakis, lichen aureus and pigmented purpuric lichenoid dermatitis of Gougerot-Blum. Pigmented purpuric dermatoses are dermoscopically identified by the combination of purpuric dots or globules and orange-brown areas of pigmentation. A similar dermoscopic pattern has been described in patients with mycosis fungoidesThis glossary term has not yet been described., supporting previous evidence reporting clinical and histopathologic overlap between the two entities. Since the pigmented purpuric dermatoses and mycosis fungoides notably differ in physical course and managementThis glossary term has not yet been described., lesions showing a dermsocopic pattern of pigmented purpuric dermatoses should be evaluated carefully.
Darieris an autosomal dominant disorder discovered by French dermatologist Ferdinand-Jean Darier. Darier's is characterized by dark crusty patches on the skin, sometimes containing pus. The crusty patches are also known as keratotic papules, keratosis follicularis or dyskeratosis follicularis. Mild forms of the disease are the most common, consisting solely of skin rashes that flare up under certain conditions such as high humidity, high stress or tight-fitting clothes. Even in mild forms, short stature combined with poorly formed fingernails containing vertical striations are diagnostic.’s diseaseIn Darier’s disease, dermoscopical analysis highlights the characteristic pseudocomedones and therefore is an effective additional tool for its clinical recognition. Vascular patterns are unspecific, comprising erythema, dotted and linear vessels.
For cutaneous mastocytosisis a form of mastocytosis that primarily affects the skin. There are three main forms of the condition: maculopapular cutaneous mastocytosis (also called urticaria pigmentosa), solitary cutaneous mastocytoma, and diffuse cutaneous mastocytosis. There is also an exteremely rare form called telangiectasia macularis eruptiva perstans. The signs, symptoms and severity of the condition vary by subtype. four dermoscopic patterns have been defined: light-brown blot, pigment networkGrid-like pattern consisting of interconnecting pigmented lines surrounding hypopigmented holes., reticular vascular pattern, and yellow-orange blot.  Dermoscopic pattern varies depending on the subtype : In maculopapular mastocytosisThis glossary term has not yet been described., light-brown blot and pigment network predominate. In solitary mastocytoma, a yellow orange blot is typical. In all cases of telangiectasia macularis eruptiva perstans, a reticular vascular pattern is present. The reticular patternA lesion with a reticular pattern has typical pigment network throughout the entire lesion. of the vessels is even proved associated with an increased risk of need for daily use of anti-mediator medication. Therefore, dermoscopy in combination with other variables could provide additional help in the identification of patients at risk for more severe symptoms.
Scarce evidence exists on the dermoscopic pattern of vasculitides. Henoch-Schonlein purpura has been shown to dermoscopically reveal irregularly shaped red patches with blurred borders. Reported findings of urticarial vasculitis are described above.In granuloma faciale, the specific dermoscopic features are dilated follicular openings, perifollicular whitish halo, follicular keratotic plugs and linear branching vessels. Clinically, granuloma faciale has to be differentiated from sarcoidosis, discoid lupus erythematosus, lupus vulgaris, lymphomaThis glossary term has not yet been described. and basal cell carcinoma. The mentioned dermoscopic patterns simplify clinical differential diagnosis. But the distinction from discoid lupus erythematosus, which exhibits similar findings, remains challenging.
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