Introduction:

Paederus dermatitis is an irritating inflammation of the skin characterized by erythema and blistering lesions, appearance in exposed areas of the body, which have contact with the arthropod of the same name. Clinical case: 39-year-old patient, indicates that while doing gardening work he was in contact with a two-color arthropod that was in the inguinal region and proceeded to crush it when trying to move it away. Two days later, I presented continuous intense itching accompanied by a single, wide, erythematous plaque with undefined edges, in addition to a small, non-fluctuating papule located in the right inguinal region; after 12 hours, he reported burning pain in the affected area that prevented him from walking. He was treated with antibiotics and antihistamines, with resolution of the condition after 10 days. Discussion: This dermatitis should be considered against sudden onset, pruritic lesions in exposed areas of the body. Epidemiological history makes an important contribution to diagnosis.