I am not a man i cannot say ,but it could not be HIV, HIV ARS comes 10-20 days after exposure, If the virus can infect so quickly how could it call chronic disease. I found my friend told me they have blister after sex it was because of friction, it will go for 2 or 3 days.
what about the irritation
still no change the fact you have no risk, you used protection
this happened in Dubai..not china
She put another condom on was because she felt it was nasty to blowjob you on a used condom believe me~ and in China very few hooker carry HIV less than 1/1000, but over 10% gays carry hiv. relax