Many: Dry skin, infestations (e.g., scabies), skin disorders (e.g., atopic dermatitis, psoriasis, lichen planus), medications, metabolic deficiencies (e.G, . Low iron), hematologic disorders (e.g., anemia, lymphoma). Infections, thyroid dysfunction, renal disease, etc. Therefore, a proper evaluation by a physician is warranted.
Answered 10/3/2016
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