We noticed on my 7 year olds left foot, what appeared to be a hard point at the end of his 4th toe. He says its painful to the touch, and it looks like there is an extra nail bed or bump under the nail. Originally, we took him to a dermatolgist thinking it was a topical issue, but when his foot was X-rayed, there is a visable mass at the end of his 4th toe joint. But the mass seems to be pointing upward or in a different direction than the normal distal. We have an appointment coming up soon, but wanted to get some quick advice as to what could cause this, or what it would be?