First it really depends on the extent, if severe you need to see a vet because antibiotics might be required.

If benign clean the area with betadine, and apply triple anti-biotic ointment.

Make sure the area stays nice and clean, and if this is a small area it should clear up with the next shed.

Replace your substrate by paper towel.

Get an heavy ceramic water dish to make sure your BP does not tip it over in the future.