Moth cocoon dermatitis is a dermatitis causes by moth cocoons.


The wings of moths are covered with tiny scales. Most larvae of moths have venomous hairs. The venomous hairs have a tubular hollow that communicates with the venom glands in the body. The venom glands contain light yellow, alkalescent, irritating venom fluid. If humans are in contact with venomous hairs, dermatitis may occur. When a larva develops into pupa in the cocoon, the larva can break the venomous hairs and construct them in the cocoon, and there are some venomous hairs on the outside of the cocoon. After the pupa develops into moth and escapes from the cocoon, if humans are in contact with the moth cocoons, venomous hairs can pierce the skin, causing dermatitis.

Signs and Symptoms

There are mostly flushing and swelling of the skin, with papules on the center, and vesicles may be present in some patients. There are irritation and burning sensation on the skin. The rash gradually subsides in 2 - 3 days. If there are secondary infections, the course of the disease can be protracted.


If there are a history of exposure and clinical manifestations, the disease can be diagnosed.


Topical calamine lotion can be used, and oral antihistamines are appropriate if there is irritation after external treatment.