Parasite on Naso?
 

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.

https://i.ibb.co/B2YpSvnx/Screen-Sho...8-34-53-PM.png
https://i.ibb.co/TxYfk2yZ/Screen-Sho...8-35-19-PM.png
https://i.ibb.co/cXpYN1BY/Screen-Sho...8-36-49-PM.png

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?