Skin discoloration results from various components. Some are natural, such as moles and birthmarks. Others are associated with components such as sun exposure (e.g., dispersed superficial actinic porokeratosis, hyper pigmentation) or allergy or immune reaction (lichen planus). The skin can get darker (e.g., acanthosis nigricans, progressive pigmentary purpura) or lighter (albinism, vitiligo). The term "skin [...]
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