 [ Symptoms ] i was diagnosed with strep throat and given penicillin for 7 days it came back and now on zpac and it is not working it came back a few days after antibiotic was done i do not think zpac is the right antibiotic what is the most effective antibiotic for a strep throat  [ Disease ] a description no matter how specific is not sufficient to make a blind diagnosis of this skin condition as much as i would like to help you you will need to physically see a medical professional so you can be properly examineddiagnosed and perhaps have this skin condition lab tested there are many things that can cause the bumps you are trying to describe and it would not be prudent to just guess based solely on the information in your posting