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baby's birthmark develops yellow pustules?

My son, now five months old, was born with a pinkish bald spot on his head. It develops yellow pustules (gross, I know) from time to time, and the pores get clogged like blackheads. Two doctors he has seen at his well visits have said they aren't sure what it is, but that it will probably go away. It has stayed the same shape, and appears to be growing with his head as he gets bigger. Any ideas?
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replied January 18th, 2015
Welcome to e health forum.

It is not possible to ascertain the condition that your son has, without a complete medical history and a proper physical examination.

But the description provided point to Epidermal Nevi.

An epidermal nevus is an abnormal, noncancerous (benign) patch of skin caused by an overgrowth of skin cells. Epidermal nevi are typically seen at birth or develop in early childhood. They can be flat, tan patches of skin or raised, velvety patches.

Infection of the hair follicles or the sebaceous glands in the skin, forms follicles, which appear as yellow pustules.

It would be recommended that you seek a opinion with a Pediatric Dermatologist who can provide proper medical opinion.

I hope this helps.

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