Hi there ~
I understand your concerns and it might be worth your while to get yourself screened for STDs and repeat the testing in a week or two if everything is negative, just to make sure you have not contracted a sexually transmitted infection. About the swelling and the white area, I think it was folliculitis
due to not maintaining good genital hygiene and you will do well with taking medications for the same and keeping the are clean. Folliculitis might be the reason and keeping the area dry and clean using an antibiotic powder might be the solution to your problem. Also consult a psychiatrist
if you continue to be anxious about the whole situation. It may also be helpful to stop using meth
, even if it is occasional use.
I hope this helps. Take care and have a lovely day!