My 21 month old son has had a scabby rash behind one knee for over 6 months. The doctor thought it was yeast and at one time gave us prescription yeast cream for it, but it did not go away. We have since tried EVERYTHING to get rid of it including neosporin, gold bond powder, resinol, etc. It occasionally gets better for a few days but then it always gets worse again, it never completely goes away. In the past two days he has also developed small pimple-like red bumps with dark tiny little head on them all over his legs. Overnight they spread to his arms and cheeks. What could these two things be and how can we get rid of them??