My four year old son developed a rash on the knuckles of both hands on Saturday and it is continuing to bother him, turning more of a brownish color now. At first I thought maybe he rubbed them a bit raw playing games on the carpet (it looked just like that), but he said he didn t do that, the location would be hard to get to that way, and the duration and change in the rash indicates it wasn t a friction thing. The rash is smooth and doesn t seem to be spreading much -it still contained on the knuckles, but the itching seems to be getting worse.