there really is no sure way of knowing without inspecting the blisters. however because of the reddening of the skin it leads me to believe you have an allergy. keep in mind an allergy can appear at any time. you could eat peanuts all your life then one day have a reaction. she could also have a yeast infection which has been passed on to you. it's rare for a male to get blisters from a transferred yeast infection but it can happen. yeast infections can be transferred during intercourse but it isn't a true sexually transmitted disease. women can get yeast infections from antibiotics or wearing panties that don't "breathe". and lastly the reason i want you to go to the dr. for inspection of the blisters. herpes. don't fly off the handle. i think this is the least likely. also keep in mind that herpes is not just transferred by intercourse. if she has a cold sore or "fever blister" on her mouth she could've transmitted it to you via oral sex. please don't automatically think your wife is cheating! get an accurate diagnosis from your doctor before you even give it a first thought!
what reason is my glans and penis have erythema and blisters after having sex with my wife? . when i used condom there is no problem. i feel a bit itchy and uncomfortable.