Hi I live in Canada, just before leaving, had small blister on left hand, now several blisters, and now on right hand, spreading, painful, sore starts with lump, then to a blister, have many allergies, put peroxide on and it foams and burns, was wondering what I should do now. I am in the usa on visit till end of September. Any answers would be helpful. Female, 61 medically good, have slight high bp and thryroid, otherwise healthy, some allergies.