Allergic contact dermatitis is an inflammatory process induced by direct contact of the skin of a sensitized individual to an allergen.
A condition of persons of any age, but particularly children with a genetic proclivity for allergic rhinitis and conjunctivitis, and allergic asthma.
A papule, sometimes eroded, ulcerated, crusted, or keratotic, on a helix or antehelix consequent to the effects of persistent trauma.
An inflammatory process characterized by symmetrical distribution, especially on the skin of the scalp, overlying the scapulae and the sacrum, on the buttocks, and on the extensor surface of the extremities, of clusters of urticarial papules, papulovesicles, and vesicles that are so intensely pruritic that they soon are scratched away, leaving in the wake erosions, ulcers, hemorrhagic crusts, and eventually pigmented macules and scars.
An inflammatory process that results from the effects of a drug administered systemically, e.g., by ingestion, inhalation, injection, or application rectally, and manifested usually by lesions distributed widely and symmetrically.
Circular orange-red-blue macule(s) or patch(es) that often becomes a papule(s) or plaque(s) and vesiculates, healing with hyperpigmentation, and that occurs repeatedly at the very same cutaneous and/or mucous membrane site(s), especially the genitalia, perioral region, and hands, in response to systemic administration of a particular drug or chemical, chief among them barbiturates and sulfonamides.