Cold sore and blister are not the same thing?

cold sore vs blister. Blisters can be caused by friction, a burn, cold environment, contact with irritants or allergens, drug reaction, an autoimmune disease, an infection, or genes. Cold sores are caused by certain strains of the herpes simplex virus (hsv). A cold sore occurs on your lips whereas a blister can appear pretty much anywhere but is most common on feet and hands. Hope this helped :].