Hi, some dragons develop spots sort of like freckles but they can also develop melanoma. A biopsy will reveal if it is so schedule a visit with a qualified vet. I hope it's just harmless blemishes though , please update if + when you find out !
I agree, most of the time, pigmentation spots/freckles are completely harmless. As AHBD suggested, they can develop
skin cancer or tumors, etc so for now, just keep an eye on any suspicious areas to be sure they don't change.
Keep us posted on him.