| Erythema multiforme | Target-shaped papular and vesiculobullous lesions distributed symmetrically on extremities and mucous membranes |
| Gianotti-Crosti syndrome | Monomorphous, pink to red-brown papules or papulovesicles distributed symmetrically on the face, extensor surfaces of the extremities, and buttocks; asymptomatic or mildly pruritic |
| Lichen planus | Flat-topped, pink to violaceous, shiny, polygonal papules with overlying white scales (Wickham's striae) on the wrists, shins, scalp, lumbar region, glans penis, or mucous membranes; intensely pruritic |
| Papular urticaria | Linear clusters of papules, vesicles, and wheals on exposed skin that spare the genital, perianal, and axillary regions; intensely pruritic |
| Scabies | Inflammatory papules, burrows, nodules, or excoriations typically on the finger webs, wrists, elbows, axillae, or buttocks; intensely pruritic |