Condition	Characteristics
Drug reaction	Maculopapular or urticarial eruption, short-lived, recent onset, no pigmentation
Acne vulgaris	Comedones, papulopustules, nodulocysts on the face, back, and chest
Secondary syphilis	Maculopapular, papulosquamous, pustular, or acneform eruptions mostly prominent on the head, neck, palms, and soles
Urticaria pigmentosa	Disseminated brown-red macules and papules on the trunk and extremities; may exhibit wheal and flare when lesions are rubbed
Lymphocytoma cutis	Discrete nodules that may be pruritic or painful; localized to face, chest, and upper extremities