I actually had these myself several years ago on my hands. My doctor measured it and prescibed Bactroban thinking it was a type of bacterial infection, it came and went over a 18 month periode and then just went away, showing up again about a year later. After seeing a few specialist we discovered it was a rare reaction to a very specific type of rubber that is found in some of my equipment, and believe it or not is also used in making nylon, so I would just about bet your sons backpack for school is your culprit.


