This disease occurs primarily in Florida, and it involves severe infection of the foot and associated pastern. This disease can cause loss of portions of the hoof, bone, and soft tissues, leading to permanent lameness if not aggressively treated. Parasitic infestations of the skin often occur. Lice, ticks, and gnats are observed in folds, under the mane, and in the ears. Treatment with shampoos containing pyrethrin, permethrin, or other parasiticides provide effective treatment.
Treatment is by excision and treatment with anti-parasitic drugs and ointments.
These sores can appear anywhere on the horse's body, but commonly are found on the sheath and legs. Larvae of the Onchocerca species produce nodules on the chest and neck. Skin tumors are one of the most frequent cancers from which horses suffer. Squamous cell carcinomas often occur around the eyes or the sheath in light-skinned horses. This tumor usually is very malignant and spreads to surrounding tissues quickly.