Hello, Thank you for posting your query. The condition you are referring here might not be pimple/acne as its not the usual site for the condition. As you have not indulged into sexual activity, i could rule out the possibility of any sexually transmitted infection. Lastly from your history of shaving,i could deduce it might be a razor bump which could have got secondary infected. The good thing is its pretty common condition and easily treatable. Go for a short course of antibiotic like cefadroxil for 5 days with some oral analgesics. Apply a cream containing mupirocin twice a day over affected area gently for a week. Always use good quality shaving cream/gel and razor and make sure your not overdoing the shaving as the skin over this area is very thin and sensitive. Hope this will take care of your problem. Wish you best of health. Take care.