Hyperpigmented structureless areas (blotches)

From dermoscopedia

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Description In this chapter we describe the dermoscopy term hyperpigmented structureless area (blotch) and its histopathological correlation
Author(s) Ralph P. Braun · Katrin Kerl · Oriol Yélamos
Responsible author Ralph Braun→ send e-mail
Status unknown
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 pigmented. In a blotch the melanin pigment is often present throughout the skin, including the stratum corneum, epidermis, and the dermis [1]. The dark pigment in a blotch visually obscures the ability to discern any underlying structures [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.