DS1 has had this for quite some time. It goes very pale to very red. Doc said they didn't believe it was psoriasis or eczema. He had a yeast rash on his bum and they thought this might also be yeast, but the cream didn't help.
Has anyone else had to deal with a similar condition? (I hesitate to call it a rash). It's primarily behind his knees, but he has a few spots elsewhere on his legs.