Parasite on Naso?

[hillegom]

I was away for a week and came back to see the nano had a bump on each side of his body. At the same place, the same shape
I am worried. It is going to be a nightmare to catch him.
What do you guys think?
Please disregard the bubbles in the water and the dirty glass.

[hillegom]

update
I forgot all about this thread. Quite a while ago, that bump slowly got smaller and isn't there any more.
I suspect an injury and it healed?