Wrist patch: Brown spots can because by many different things. One of those is sun damage but at 26 i would not expect that to happen. It could be that you spilled some lime juice on your arm and then got in the sun! i named a condition called margarita nose in which this happened as a transverse line across the nose which was hyperpigmented or darkened.
Answered 8/14/2013
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A doctor has provided 1 answer
A doctor has provided 1 answer
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