For the last couple of years I have been getting small clear blisters on my fingers, usually on my thumb, forefinger, and little fingers, on both of my hands. It is spring now and the weather has just gotten warm and the sun is shining brighter now, but spring also marks the beginning of my blisters. I have the blisters from spring until mid-fall and then they are gone throughout the whole winter. Again they are clear blisters that form in tightly packed groups, and without touching them parts of the group will go away leaving an area of new skin and a clear line where the old skin and the blisters are. The blisters seem to come and go in the same area, rotating between new blemish free skin and old skin with blisters. They do not itch and so far have not spread beyond the backs of the fingers i have mentioned. I think that these blisters are caused by exposure to the sun, and I should ad that I live in the northern part of the US and I do not actively sun bathe. I just want to be sure that these are symptoms of something more serious. Thank you for your help.