It causes a disease known as equine coital exanthema. The aforementioned diseases usually present with exanthema and enanthema. Allergic symptoms were observed in 1.1% of patients and include&colon; exanthema, urticaria, and pruritus. Galen notes that the exanthema covered the victim's entire body and was usually black. In people, local exanthema appears on the arms and face. Other common side effects include headache, dizziness and exanthema, which is usually transient. He observes that in cases where the stool was not black, the black exanthema appeared.