Hi Thank you for asking HCM I have gone through your query. How is the bump looks like? Is it like fluid filled eruptions? Any associated itching or burning sensation? If you send a picture then it will be more helpful in analysing it. If it is fluid filled rash associated with burning and itching sensation then it is most likely genital herpes and in such case acyclovir cream for local application and Oral famcyclovir will be helpful. But if it is just itching and rashes which are non fluid filled then it can be due to fungal infection or allergic reaction to some thing you used recently. In such case i advise ointments with combination of antifungal like clotrimazole and corticosteroid betamethasone. Hope this may help you. Let me know if anything not clear. Thanks.