Several conditions: A common conditon is pittyriasis alba which may be related to mild eczema or dry skin. Also, skin infected with the fungus tinea versicolor does not tan normally. This is more common on upper chest and back. If the skin feels very smooth to the touch, it may be vitiligo, a skin condition where the pigment cells in the skin have been destroyed, usually by autoimmune. Your doctor can diagnose
Answered 1/9/2019
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