Two weeks ago I went to the barber and he shaved the back of my head with a clipper, then used a blade near the hairline on the back of my neck. Most of the time, after each visit I get a mild breakout of small pimples that go away in a few days. There was one located on the left side right at the line where the hair ends. it rubbed against my shirt and/or coat collar and became infected (after I picked at it). Now it is infected with swelling and pain going down the side of my neck almost to the collarbone. I went to see a healthcare professional (a nurse that can prescribe medication) and she determined that Clindamycin is the best antibiotic since I'm allergic to Penicillin. My worry is that it might not be strong enough and the infection will get worse. What should I do? Thanks!