Hopefully, it isn't chytrid. ACFs are carriers of the deadly disease and usually do not succumb to it. Rough, patchy skin indicates a possible parasite infection and of course, reddish skin around the limbs indicates red-leg, a bacterial infection. Without knowing the cause, it would be difficult to find an adequate treatment. If it is chytrid, itraconazole (Sporanox) may work. The most common illness is bacterial in nature. I suggest using Lynmozyme, a probiotic medication for frogs and tropical fish.