My son, age 21 and a Junior in college, was home this weekend and complained about his feet hurting. I looked at his feet and on the padded area behind his toes and I could see what appeared to be little bumps that looked, for lack of anything better to describe them, like pimples (they seemed to have a little center that looked like pus , but he said the centers felt hard like a callous). He said that they had reached a stage where it was getting hard to walk without pain . Would you have any idea what this is and, if so, how best to treat it?