blue tang Sick

[Cole Harlow]

So over the last 3monthes i have noticed my blue hippo tang start to develop large areas of brown colorless skin. i tried putting garlic in his food but that hasnt helped recently i noticed him rubbing against a anemone in my tank i think its a bubble tip. after he rubbed against the anemone there was a large white patch of skin which soon faded back to its normal color. so my question is does anybody know what kind of disease this is, was he rubbing against the anemone to get the stuff on him off.
Thanks

[Boonjob]

got any pics?

[Cole Harlow]

Ill try and take a pick or 2

[slandis3]

Is the discoloration near the eyes?