Isolate the goat and treat early and aggressively. Clip the hair, remove any scales/crust, scrub with Nalvasan or Betadine, apply topical antifungals often, and continue for up to six weeks. Be sure to disinfect all equipment and the area daily. You may need to use a systemic antibiotic like Penicillin G or Nulfor (extra label use by a veterinarian) if the fungus is deeper than the skin only. In some cases, a systemic antifungal drug is needed, and these will have a long withdrawal time. Remember that a skin fungus is contagious to humans and hard to treat. Take precautions. Consult your veterinarian when using any medications on goats.