What is this yellowish brownish dot on male side fin ; where body and side fin meets??

[yassy]

What is the yellowish dot on his bottom of his side fin??

 

PH 8

 

Ammonia 0-0.25 (I cannot tell if it has tad ammonia or zero ammonia with AP master test kit color..)

Nitrite 0

Nitrate 10

Temp 78F

 

Thank you.

[Fish Folk]

Unless you can either link a video, or take a clearer photo, it is very hard to tell. There are two places where coloration seems a bit off...

This may just be ordinary pigmentation. However, if it appears "fuzzy" I'd be worried it may be fungus.