How to Quickly Reduce Swelling and Relieve Pain After a Horsefly Bite

Bite wounds from horseflies can be treated with topical diphenhydramine ointment, dexamethasone ointment, or traditional Chinese herbal ointments to reduce swelling and relieve pain. Immediately following a horsefly bite, the affected area typically develops rapid onset of erythema, swelling, pruritus, pain, and induration—primarily due to an allergic reaction triggered by toxins introduced into the body by the insect. Individual responses to the bite vary depending on constitutional factors; some patients may additionally experience systemic symptoms such as fever, nausea, and vomiting.