Strange spots/lumps

My little Dilly girl has had these forever. They don't seem to do her any harm however. She has an amazing appetite.
I have no idea what they are; are they just part of her coloring...?
Her coloring in general is somewhat... strange, but it's always been like that. Those lump things are still quite strange :s

If it could possibly be anything like parasites or something... I want to treat her asap :/

All her tank mates are in perfect health and have nothing like this.
All water parameters are perfect (NO3 and NO2 both color white when testing, pH is 7.2, KH is 8, GH is 13, ammonia is around 0.01ppm)
Temperature is a constant 16 degrees.
I work with a juwel bioflow 8.0 filter, containing a cirax case, a nitrate sponge, a poly pad for holding the biggest filth and the rest is filled up with regular sponges.

It looks like those are just iridiphores, although I've never seen them zoomed in that much!

Are they new? They could just be her lateral line? My leucistic has very small yellowish markings along him which I just presume are the lateral line.

looks like normal axolotl skin to me! they are always covered with lumps and bumps. The older they are the more lumpy they seem to get too.

If he is not acting strangely, or looking sick, there shouldn't be anything to worry about.