Try domeboro soaks to dry the affected area. I would not recommend Potassium permanganate. The only approved uses are for fish tank and industrial cleansing. There are no registered products con- taining potassium permanganate.
Potassium permanganate used in pesticide products is derived from commercial producers.
As a bactericidal, fungicidal, and algaecidal agent in cooling towers, evaporative condensers, air wash systems, ornamental ponds, cooling fountains, aquaria, human drinking water, and poultry drinking water as applicable. Potassium permanganate is also used as a surface disinfectant, sanitizer, and deodorizer. As a disinfectant, potassium permanganate is diluted according to label directions and applied to hard, non-porous, inanimate surfaces. For the other uses described above, potassium permanganate is added directly to the water to be treated. For aquaria and ornamental ponds, use 4 ppm a.i. to control algae growth.