Intense cold can trigger frostbite, which often leads to blisters once the skin is rewarmed. The treatment for blisters caused by eczema, infections and other diseases varies. In most herpes infections, blisters can return in the same spot such as fever blisters on the lips or genital herpes weeks, months or even years after the first blisters appear.
You also will be asked about any recent exposure to irritating chemicals or allergens. Because blisters protect the underlying skin, breaking blisters open can increase the chance of infection.
Any type of burn, even sunburn, also can cause blisters. Treatment Usually, it is best to leave blisters alone.
Be particularly vigilant about avoiding sun exposure if you are taking medications that are known to cause sun sensitivity, such as doxycycline sold under many brand names. The autoimmune diseases also known as bullous diseases because of the large blisters seen vary in appearance as well. Some blistering diseases are diagnosed with a skin biopsy, in which a small piece of tissue is removed and examined in a laboratory.
People who have not had chickenpox should avoid people with chickenpox or shingles until all of the blisters have crusted over. Allergies — Allergic contact dermatitis, a form of dermatitis or eczema, may result in blisters.