PacMan Frog - VERY CONCERNED?

A few minutes ago, I picked up my pacman frog, and ran it under water... it seemed to have some sort of slimy brown-red substance on it... I don't know what the **** is going on. I'm not sure of the gender, but it lives with a male Australian White tree frog. As far as I know, neither of them can eat each other. Do I need to bring it to the vet? Does anyone know whats wrong with it?