Hi, would like to have some more information about your problem: 1. what is the size of the blisters- 2. is there appearance preceded by fever
or ay other symptom 3. are there blisters on any other part of the body including genital regon 4. your age and sex 5. do you use tobaco in any form.
and please get your hemoglobin
checked as sometimes if the hemoglobin is low these blisters can appear.
There are many conditions like Pemphigus
and Lichen Planus
in which such type of blisters can appear.