Spreading Blackheads

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What is a comedo naevus (spreading blackheads)?

A comedo naevus is a hair follicle naevus. It is also known as ‘comedone naevus’ and ‘nevus comedonicus’.
A comedo naevus is an unusual type of epidermal naevus, or birthmark (hamartoma), in which there is a localized collection of dilated follicles filled with keratin. It is more accurately termed follicular keratotic naevus, as there are no true comedones.
What does comedo naevus look like?

Comedo naevus is usually present at birth or develops in early childhood. Males and females are equally likely to be affected. Lesions often grow more quickly at puberty. They can appear anywhere on the body but are most commonly found on the face, trunk, neck and upper extremeties.

The lesions appear as closely grouped slightly elevated papules with central keratinous plugs so they look like comedones. They may be distributed in a linear, interrupted, unilateral or bilateral pattern and sometimes follow the lines of Blaschko.
Comedo naevus


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nevus comedonicus