The skin is the site of several common disorders that include acne vulgaris, psoriasis, eczema dermatitis, contact dermatitis, drug-induced dermatitis, and burns. Some disorders result from viral infections such as herpes simplex and herpes zoster. Some result from fungal infections such as tinea pedis (athlete's foot) and tinea capitis (ringworm).
Lesions may also appear on the skin as macules (flat with varying colors), papules (raised, palpable, and less than 1 cm in diameter), vesicles (raised, filled with fluid, and less than 1 cm in diameter), or plaques (hard, rough raised, and flat on top).
Nearly all the disorders can be treated using mild or aggressive drug therapy in the form of topical creams, ointments, pastes, lotions, and solutions—some of which are available over the counter.
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