U need to go get tested for stds, not trying to scare u but in situations like this is good totake precaution.
Herpes look like blisters, n they can appear n dissappear at any given time, usually they do burn, but then again u might have an infection of some sort.
Get checked!!
you need to be seen again for these. many bacterial skin infections will come back. MRSA is the main concern so it's a good idea to follow up on this properly.
this isn't likely to be a std but certainly if your provider suspects they are, full testing is a good idea.
grace