Whitespot or izit?

#1
I just notice these whitespot which only develop on the head of Lau Pan, are these natural pattern or some sorta parasite? The pattern quite like natural formation.

Lau Pan eating very little, still hang around the corner most time like indicating something is wrong but I've no idea, my other tank mate the 3 lampan and 1 feeder tilapia all having a good time.

NH3/4 = 0
NO2 = 0
NO3 = 10
PH = 7.5

Anyone any input? thanks...