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Pityriasis Rosea -Skin condition, primarily of teens and young adults, which typically affects torso, but may appear on the thighs, neck or upper arms -Exact cause is unknown, but mat be linked to antecedent upper respiratory viral infection, which itself is usually asymptomatic -Initially consists of a solitary plaque with scaly borders, oval or round in shape, which then spreads to other areas in crops Pityriasis rosea is a skin condition which first appears on the torso, usually as a solitary oval or rounded plaque, and may spread in crops to the thighs, neck or upper arms. The primary plaque is known as the "herald patch", as it heralds the onset of the rash. Subsequently, similar smaller lesions appear in other areas of the trunk and spread outward, typically following the lines of the ribs. These lesions may form a "christmas tree" pattern on the back. Lesions are pink in color, scaly and accompanied by itching in some cases.The rash typically resolves in 6 to 12 weeks, and does not generally leave scars or marks. The rash is not generally accompanied by a feeling of unwellness. The exact cause of pityriasis rosea is unknown, but it often appears in association with prior respiratory viral infection, though once the rash appears, is not infectious. The condition typically appears in young adults or teens, and only rarely recurs in affected persons.......ref : onlineDermClinic
