From dermoscopedia

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Description This chapter describes dermoscopy of Dermatitis
Author(s) Sabine Ludwig · Aimilios Lallas
Responsible author Aimilios Lallas→ send e-mail
Status unknown
Status update July 11, 2017
Status by Ralph P. Braun

Dermatitis: yellow scales and dotted vessels


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.[1] 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.[1] Superficial 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. [1] Belonging to the group of the characteristic yellow scales, the “yellow clod sign” is frequently observed in nummular eczema.[2] 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.[1][3][4]


  1. Lallas et al.: Accuracy of dermoscopic criteria for the diagnosis of psoriasis, dermatitis, lichen planus and pityriasis rosea. Br. J. Dermatol. 2012;166:1198-205. PMID: 22296226. DOI.
  2. Navarini et al.: The yellow clod sign. Arch Dermatol 2011;147:1350. PMID: 22106141. DOI.
  3. Vázquez-López et al.: Dermoscopic semiology: further insights into vascular features by screening a large spectrum of nontumoral skin lesions. Br. J. Dermatol. 2004;150:226-31. PMID: 14996092.
  4. Lallas et al.: Dermoscopy of early stage mycosis fungoides. J Eur Acad Dermatol Venereol 2013;27:617-21. PMID: 22404051. DOI.