My pastel has a pinky/red spot on him, near his tail, but he just shed a few days ago, and I only have heating lamps until I build racks.

*He also has not ate since december, it could of been from the winter, then a really bad shed, I noticed a few months ago that he started loosing weight, so I took him to the vet, he said he doesn't see anything really wrong with him, so he gave him a shot, that's supposed to make him hungry and give him vitamins, also put him into a shed, and his shed was perfect, I'm getting very confused, and would love some help thanks.