Several ideas: He knows if it's an old injury. Superficial fungi will make the overlying epidermis look slightly different if viewed at an angle, maybe. This may also be vitiligo (if it's new), a simple birthmark (poliosis), or any of dozens of other possibilities. If it's new or changing, or if it bothers him, a dermatology visit may be in order.
Answered 4/26/2015
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4 doctors weighed in across 2 answers
A doctor has provided 1 answer
4 doctors weighed in across 2 answers
A doctor has provided 1 answer
A doctor has provided 1 answer
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