tang fingerprint disease

[3450500]

I noticed that my chevron tang has a white spot that is about 1/8" around any thoughts. he is eating well and swimming all over the tank had him about 3 weeks. any help would be apprecated.

 

[edd]

my chevron had the same white dot on his head, went away in a couple of days.

 

[3450500]

ok his is on the between the mouth and the gill