Spots on mice??

[Ruby]

I'm switching over to perfect prey and big cheese rodent factory, but these mice are from hare today gone tomorrow (repackaged Layne labs)

I've never seen spots or rings on rodents? From the 5 I pulled, all of them had these spots.

I'm going to investigate the rest of the bag tomorrow, but I think I'm going to chuck it in the bin.

has anyone else experienced this?
I don't think it's ringworm or mange.