Hello,Jock itch while common on the groin are much less so on the pubic area.Seborrheic dermatitis is a form of
dandruff affecting areas like scalp,groin,pubic area.This could itch too.If you have scalp dandruff this is a possible diagnosis.Also pubic lice may not be easily visible and may look like a black dot at the hair root.This would respond to permethin application.With these in mind ...