Yes it definitely does appear from your history & description to be a part of the skin.
I dont know if this can be an STD
related problem. You will have to supply a better sexual history preceding this eruption/swelling.
I would not advocate squeezing the lesion...it will cause more damage & leave behind an ugly pigmentation.
It would be more adviseable to go meet with your dermatologist
or surgen on the ground.
An antibiotic & antiinflammatory agent three times daily after meals (metronidazole
) according to body weight is the way forward.
Please get an STD profile done according to your history & the doctor's clinical suspicions.
All the best for your planned parenthood & wish you good health!
Dr Praveen Rodrigues MD