I use athletes foot powder personally, this helps fight Tinia Curis (Ringworm of the groin). I had a VERY bad case in 1989 which was made even worse by the treatment with Canestan. Turned out I was allergic to it so this made the complaint even worse. At one point I was having to use sanitary towels in my pants to absord the puss! Took aboyt 2 months to get under control and in the end this was achieved with an intramuscular injection every 2nd day for 2 weeks! I assume it was a steroid injection.
So I remain very prone to fungal infections in the trouser area and often have a recurrence (suffering from one now). Have to use Daktacort to treat it, so that is why if I can’t shower or bathe after a ride I use anti fungal powder.