Hi Thank you for asking HCM. I have gone through your query. Darkening of genital area can be due the action of sex hormones. That occurs in most people and it is normal. Even fungal infections this can occur and in such case applying ointments containing anti fungal agents like miconazole and corticosteroid like flucinolone will be helpful. Vitamin c based creams or kojic acid soap is helpful for whitening the area also. Hope this may help you. Let me know if anything not clear. Thanks.