There was a really good thread about fish diseases, i'm sure it would have been of great help since what your fish has was discussed.

Your clown seems to be having a case of Lymphocystis. I had that happen to a clown once (perc). His lip fell right off. I couldn't treat fast enough, he died within a day. Its a fungal infection and i'd love to help you treat, but please IM me..i'd love to help you out.