i sucked my thumb growing up. my parents did everything possible to make me stopi quit on my own when i was 15 and surprisingly, started again while i was pregnant with both my kids. i never got any blisters from it. i was thinking foot and mouth disease also. you should see your dr, those blisters can be pretty painful.

Try some cortisone(sp) cream. I get blisters over my hands & mine is dermatitis.  You can get5 it from any chemist & it helps any rash.

As long as the blisters are not becoming infected I don't think you have anthing to worry about, it sounds like your little fellow is just getting carried away with sucking his thumb....but if you are concerned talk to your doctor on your next visit with them.

Regards Janice

Could it be foot and mouth disease? Talk to your GP

my son gets them on his fingers from time to time, my Gp said it was from chewing on his fingers,  i was told to replace his fingers with a chewing toy. it works, sometimes.

if your concerned see your local GP/ Health nurse for a solution to stopthe blisters.

hope this helped a little