By Gary M. White, MD

Paederus dermatitis is an irritant contact dermatitis caused by the Paederus beetle. The beetle releases a paederin-containing fluid that can cause irritation and blistering.


A very itchy, vesicopustular eruption develops in skin that has come in contact with the beetle. Specifically, the rash starts to develop about 24 hours after contact. Erythema, pruritus, and at times burning, is present. Later, vesicopustules develop. Finally a scab forms with desquamation and possibly postinflammatory hyperpigmentation. In severe widespread cases, there can be fever, arthralgia, and vomiting.


Topical steroids are usually given.


Dermatol. Argent., 2015, 21(1): 56-58

Indian J Dermatol. 2013 Sep; 58(5): 410

J Clin Aesthet Dermatol. 2011 Nov; 4(11): 44–46


Homepage | FAQs | Use of Images | Contact Dr. White

It is not the intention of to provide specific medical advice, diagnosis or treatment. only intends to provide users with information regarding various medical conditions for educational purposes and will not provide specific medical advice. Information on is not intended as a substitute for seeking medical treatment and you should always seek the advice of a qualified healthcare provider for diagnosis and for answers to your individual questions. Information contained on should never cause you to disregard professional medical advice or delay seeking treatment. If you live in the United States and believe you are having a medical emergency call 911 immediately.