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Der­ma­tol­ogy is the branch of med­i­cine deal­ing with the hair, nails, skin and its dis­eases. It is a spe­cial­ty with both med­ical and sur­gi­cal aspects. A der­ma­tol­o­gist treats dis­eases, in the widest sense, and some cos­met­ic prob­lems of the skin, scalp, hair, and nails.