According to the Merck Veterinary Manual, "cutaneous habronemiasis or summer sores are a result of fly larvae which enter existing wounds or moist skin and migrate into the tissue causing irritation and a chronic granulomatous reaction". As such, management of this condition involves fly control, medication for encysted larvae, AND medication for inflammatory reaction. Fly control is an ongoing issue at most farms and becomes increasingly important as the warm, summer months approach. The most common method for treating for the encysted larvae is a simple dose of oral ivermectin. Unfortunately, this is were most horse owners stop with treating summer sores. There are a multitude of topical therapies which include varying amounts of ivermectin and antibiotics. Unfortunately, these topical therapies are NOT appropriate for treating the chronic inflammatory reaction. As a result, many summer sores continue to increase in size and result in horrible wounds as imaged in Figures 4 and 5. These represent the MOST common location for summer sores in horses that being the lower limbs.