Anthrenus dermatitisL23.9

Itchy urticarial-papular skin reaction caused by contact with larvae of the Anthrenus beetle.

Larvae of Anthrenus scrophulariae (common carpet beetle), Anthrenus museorum (museum beetle) and other Anthrenus species.

The larvae, which feed on dry keratin-containing substances, live in wool, furs, skin scales, carpets and stuffed animals. Contact with the arrowhead-like hairs of the larva causes allergic skin reactions.

Lower leg and trunk, usually in symmetrical arrangement.

Up to 8 mm large, loosely disseminated, erythematous, partially excoriated, symmetrically distributed papules. Different degrees of itching.

Acanthosis, parakeratosis, necrobiosis of superficial epithelial layers, subepidermal edema with erythrocyte extravasations and lymphocyte infiltrates (numerous eosinophils).

Immediate urticarial reaction in the prick test with larval extract. Itchy, papular late type reaction detectable for about 4 days. Detection of larvae in the apartment.

Bedbug bites (urticarial grouped distribution pattern), human fleas (diascopically detectable purpura pulicosa), trombidiosis (urticarial plaques in the area of tight clothing), cercaria (bathing in suspicious waters).

Pulmonary symptoms with asthmatic reaction.

Preparations containing glucocorticoids. Regular sweeping or vacuuming and removal of furs, pelts, stuffed animals and wool carpets. Insecticides, e.g. pyrethrum extracts.