Could anemone hurt clown?

Tonight one of my clowns has something wrong with him. It doesn't looks like ich, it looks like skin peeling off of him on one side of his mouth and on his side. He looked perfect yesterday. Is it possibly a reaction from my magnifiscent anemone? He ate tonight and is swimming fine and still hanging all over the anemone. He was diving pretty deep into the mouth of the anemone a few days ago, but hvent seen him do it since. Anyone have any idea what it might be?

 

Possibly his slime coat got rubbed off and as a result, it got stung. Clownfish aren't immune to anemone stings....they rub slime from the anemones foot onto their body so the anemone doesn't know it's there.

 

That was my first thought, just wanted to check with everyone elses experience.