It started off as a red little bump. Now it is bigger and has a white center. I drew a circle around the redness yesterday. Today I had to draw another circle because the redness is spreading. It is har around the bump and all around it. It itches and hurts. Othing is leaking out if it. It felt like an ant bite or something like that yesterday. Now bigger and hurts worse. On my right upper thigh.
It sounds like you have an abscess. Since it is getting worse, you should see a doctor to open it up and Chat Doctor.  Usually this cures an abscess and antibiotics aren't necessary. However, if the infection is spreading out into the skin (cellulitis) then antibiotics might be necessary to keep the infection from going into your blood. Go to urgent care or emergency and get this taken care of soon. Hope this answers your query.