Bearded Dragon problem!
 

My dragon after taking a bath formed this red mark on his back, anyone know what it is or have an idea? It looks like a vein popped... Hope not!

Thanks,
Logan

are you sure that it is under and not on the skin?

Can't really determine, it looks like a mark but it just instantly appeared after giving him a bath and has been there for over a week.

Anyone have an idea?

Looks like something just came in contact with his scales and settled there. Do you have any purple soap/shampoo etc? If you do that is likely the culprit. You can try gently rubbing the spot with a q-tip and see if it comes off on the cotton swab and off the scale. If you are really worried about it only choice is to go to a vet that specializes in reptiles (especially bearded dragons).
It could also form if the water was too hot perhaps, really hard to tell.