Hyperpigmented structureless areas (blotches)

From dermoscopedia

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 Editor: Ralph P. Braun

 Author(s): Ralph P. Braun     ·  Katrin Kerl     ·  Oriol Yélamos
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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 · Oriol Yélamos
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Status update July 2, 2019
Status by Ralph P. Braun


In this chapter we describe the dermoscopy term hyperpigmented structureless area (blotch) and its histopathological correlation

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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 [1]. The dark pigment in a blotch visually obscures the ability to discern any underlying structuresThis glossary term has not yet been described. [2]. Blotches can be regular or irregular.
  1. Yadav et al.: Histopathologic correlates of structures seen on dermoscopy (epiluminescence microscopy). Am J Dermatopathol 1993;15:297-305. PMID: 8214386.
  2. Kittler et al.: Standardization of terminology in dermoscopy/dermatoscopy: Results of the third consensus conference of the International Society of Dermoscopy. J. Am. Acad. Dermatol. 2016;74:1093-106. PMID: 26896294. DOI.