Ich

Ich is basically little pimple-looking white spots. It is a parasitic infection, you would usually use one of the various medications out their to treat it such as Quick Cure. What you have might be a light fungal infection... what are you water perameters and is there any bullying in the tank?

I agreed with PumaWard. Possibly some fish took a few nips on your RD to get that look. Mine has the same look right now after being attacked by the male.

The first sign I noticed on my fish...when they contracted Ich...is scratch themselves against decors alot. Then they will start having the pimper-looking white spots on fins. At first...just a few. If not treating soon...the fish will be covered with white spots. If not being treated, they can and will die from it.

I usually treat my fish with SuperIck and raise the temperature to 82 degree. Some people will use salt and raise the water temperature. It all depends on your preference. I have never tried the salt method because I have an algae eater and a few loaches. I heard they are sensitive to salt.

Mine usually heal itself. I just make sure that they eat...and have water change to make the fish feels more comfortable. However, if not taking care of the fish probably, I heard that can cause finrot. I don't know for sure because mine never experienced it.