 [ Symptoms ] i have also got grade 3 asthma i went for a chest x ray they said that was fine but i still have a wheezing cough and pains [ Disease ] if you have a red blister that is fluid filled burns stings itches and hurts like a sob then its quite possible warm h2o helps w the pain but it will have to be cultured by your dr to know for sure if it craters after the blister is gone then probably so dont have sex until you know for sure