I am diabetic and I just recently started to get a growing lump on the back of my neck in the middle by the hairline.  It doesnt form a head as if its acne.  Its very painful.  The doctor gave me antibiotics which made it go down a little and take the pain away but the pain and swelling came right back as soon as the prescription wore off. What could this be?
HI. The first question would be how much is your blood sugar ?IF this is not controlled, will be the first reason for not healing. This can be a sebaceous cyst-infected one and can be transformed into a carbuncle if not properly treated. So go for serious course/s of antibiotics and anti-inflammatory medicines. You have to keep the diabetes well under control.