A member asked:

Outside working in heat and humidity and my palms and fingers turn black. why?

A doctor has provided 1 answer
Dr. Matt Wachsman answered

Specializes in Internal Medicine

Some ideas.: cannot say in your particular case, but generally, it is more from contact with surfaces than one's own source of pigment. Chemicals certainly can come out in sweat. Metals?

Answered 5/8/2015

2.9k views

Thank

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