Hello, Welcome to HCM, I have gone through your query.Your problem is most likely genital herpes.It can be diagnosed well when the infection is active. Swab should be taken from the fluid in the blisters. Cell culture can be done from that.You can also run a PCR blood test.But even the negative results doesn t exclude herpes. I usually give antiviral treatment acyclovir or famcyclovir for atleast five days in my patients with such case.Acyclovir ointment for local application also will be helpful. Avoid wearing tight clothes which may irritate the blisters.Keep area clean by using saline water.You can apply ice pack or wet tea bags to soothe pain.It can recur after this also when your immunity becomes low.So episodic treatment should be done in such case. Thank you.