I repeat the chant... VET VET VET...
Dermatophilosis? I don't think so. These aren't scabs or cracked open and runny things. Doesn't look like photosensitivity. They look like BUMPS.
VET VET VET
Did I mention that a vet should be involved?
An earlier respondent, I believe, suggested a vet. If enough time is used trying to get an e-consensus a vet might be too late and all that will be needed is to euthanize the beast.
Pat