Hyperpigmented structureless areas

From dermoscopedia

Main PageHistopathological correlationHyperpigmented structureless areas
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 Editor: Ralph P. Braun

 Author(s): Ralph P. Braun     ·  Katrin Kerl
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Description In this chapter we describe the dermoscopyThe examination of [skin lesions] with a 'dermatoscope'. This 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. term hyperpigmented structureless areablotch If centric hypermelanotic Clark (“dysplastic”) nevus if eccentric melanoma (blotchDark structureless areas) and its histopathological correlation
Author(s) Ralph P. Braun · Katrin Kerl
Responsible author Ralph Braun→ send e-mail
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Status update July 2, 2018
Status by Ralph P. Braun


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Hyperpigmented structureless areas (Blotches)

A blotch is defined as an area with a size that is at least 10% of the lesion’s surface area and is heavily pigmentedThis glossary term has not yet been described.. In a blotch the melanin pigment is often present throughout the skinThis glossary term has not yet been described., including the stratum corneum, epidermis, and the dermis. The dark pigment in a blotch visually obscures the ability to discern any underlying structuresThis glossary term has not yet been described.. Blotches can be regular or irregular.

Regular hyperpigmented structureless areaThis glossary term has not yet been described. (BlotchDark structureless areas)

Peripheral reticuler central hyperpigmentation schematic.jpg

Regular blotches are defined as those that display symmetry, regular borders,homogenous dark hue, and are located within the center of the lesion. A pigment networkThis glossary term has not yet been described. often surrounds a regular blotchOne blotch within center of lesion and surrounded by network. Regular blotches are associated with neviThis glossary term has not yet been described..

Regular blotch 29.jpg

Regular blotches can be seen in “activated” nevi. This structure is due to heavy concentrations of melanin in the stratum corneum. Because the pigment is present in the stratum corneum, it can easily be stripped off using a tape-stripping procedure, thereby revealing underlying structures.

Regular blotch.jpg

Irregular hyperpigmented structureless area (Blotch)

Irregular blotches are defined as those that are asymmetric, have irregular contours, are located off center, and/or display multiple dark hues (i.e., heterogenous dark hues). Irregular blotches are associated with melanomaThis glossary term has not yet been described..

Atypical blotch 37.jpg
Irregular blotch.jpg
Irregular blotch histopathology.jpg