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Blue, grey, and black colouration 

Blue, grey, and black colouration
Chapter:
Blue, grey, and black colouration
DOI:
10.1093/med/9780199208388.003.35
Page of

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date: 22 October 2019

Introduction564

Generalized forms564

Localized and naevoid564

Black colouration567

This chapter describes the better known causes of blue, grey and black cutaneous discolouration and lesions. Melanin deposition deeper in the skin, in the dermis rather than the epidermis, gives a bluish hue to the skin due to light diffraction. Slate-grey pigmentation of the skin is also known as caeruloderma. It may be localized or generalized. Very deep blue pigmentation may appear black. Causes other than melanin include tattoos, blood disorders, vascular lesions and ingestion of drugs or heavy metals....

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