White spots on the skin can be caused by sun exposure or conditions including milia, vitiligo, or pityriasis alba. The spots appear when there is a loss of skin pigment or from trapped skin cells.
When psoriasis affects the scalp, it causes thick, silvery-white or gray scales that may be inflamed and itchy. You may also feel burning or other discomfort. Psoriasis is an autoimmune skin disease ...
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