Yellow Watchman w/bump (pic)

[SkinnyPete]

Just noticed this bump on my yellow watchman goby. It 's much brigheter and bigger than is noticable in this picture, but it seems to be a bump from under his skin. The white dot is just one of the many normal dots on its body but it is distorded so it looks whiter, it is not ich.

Any ideas? It has been acting normal. Normal breathing and eating habits. Seems to be out and about and swimming as normal. Not scratching. No other fish seem to show signs of anything.

Water Params:

Trates - 5
Trites - 0
Ammo - 0
PO4 - .1
PH 8.2
SG 1.025
temp 78-80

 

[MT79]

I've noticed bumps under the skin of my Y. watchman goby also, around the head/gills and even a couple in the abdomen. I've always assumed it's normal b/c the skin is fine, no necrosis etc., and it has never showed any signs of stress in over a year. I'm not sure exactly what they are though.