My 17month old has a blister type thing appear on her hand about 6 weeks ago - I took her to the gp who said it was either a wart or something was in it which would come out - leave alone and it would go. It hasn’t and she is becoming aware of it so I took her back and this gp said she could refer us to dermatologist as it feels rough like a wart but it will takes months so we are better of paying ourselves. I have called a few but they won’t treat anyone this young. Waiting to hear from someone else to deals with children’s dermatology....does it look like a wart??