Mysterious infection on pleco - please help identify

[DHarris]

I also posted this under the diseases section but anxious to figure out what's going on here.
I began treatment with salt for one of my plecos that has ich. Another one was up against the glass and I noticed an infection of some sort that I've never seen on any other fish. There are patches on the underside, at the joints of the pectoral fins, that have raised bumps with what appear to be crosses in them.

I'e dealt with most issues over the yeas but I've never seen anything like this. Searched online but didn't come up with anything similar.

I'm hopeful someone here can identify what I'm dealing with and perhaps offer a treatment solution.

Thank you in advance!

 

[phreeflow]

Pull the pleco out and look closely to see if those translucent round things move at all. Could be fish lice. I’ve run into them on several occasions when I used to buy a lot of fancy plecos. They seemed to always congregate in the same area but they looked different than what’s on your fish. Could be a different type. I once had some bright green argulus that came off of some freshly imported medusa plecos.

 

[DHarris]

Thanks, I’ll try to get it out tomorrow. I was able to get a very good long look while it was on the glass and it didn’t appear that they were moving but I’ll check.
Not going to rush any treatments until I can figure out what I’m dealing with but out of curiosity how’d you handle those?