<s>[INST] 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. [/INST] Thanks for your question on Chat Doctor. By your history and description, in my opinion you are having the following possibilities. 1.  Skin allergy 2. Viral infection. So better to consult dermatologist and get done clinical examination. Don't apply peroxide as it can damage you more. You may need antihistamine and anti-allergic Chat Doctor.  For local application, steroid containing cream may be needed to relieve inflammation. Since all these  </s>