It sounds like you may have developed a small abscess (an enclosed infection). This occasionally can happen in areas of skin which are prone to in-grown hair development. In-grown hairs are actually small pockets of infection that have developed in a blocked hair follicle. If the infection does not clear on its own, then the pocket of infection can grow into an abscess. Putting antibiotic ointment on this probably won't hurt, but it may not help either, especially if the infection becomes walled off. Abscesses in this area often require surgical drainage if they become big enough and if they do not go away on their own. without the abscess opening up, all the antibiotics in the world will not help.
Most of the time, this type of infection is easily taken care of inside a primary care physician's office (family doctor
or internal medicine doctor
). Thus, you should probably schedule an appointment with your doctor as soon as possible. In the mean time, it probably won't hurt to place a warm compress on the area to keep it draining. This is what is needed in the end for it to heal. I hope you get this cleared up very soon.