My DS 9 has had callouses or warts (not sure but they are down the top) of both little fingers for the last. 2.5/3 yrs. he is also a big nail biter. I've just started him using the stop n' grow for the nail biting. I've also tried him on duct tape for his little fingers it worked to a fashion but the callouses/ warts came back. His hands look awful. I just wondered if anyone else had encountered these sort of problems and if so did they have any advice? He had an appt with the nurse at the end of the month and I meantime I'm taking him to visit the pharmacist.