I don't know what it is. At first I thought it was food. And it wasn't there last night. I'm worried. It's pink. He's 4 months old but was the runt. So, he's very small. He's been eating well since I got him. But I'm not sure what to do or what it is. Or if it's serious.
It does look like food, but what have you been feeding him?
I can't think of anything that would have caused an immediate, overnight bump other than some type of bite either from an insect or another dragon.
Did you try bathing him to see if it came off yet?
Does he seem lethargic at all & is his beard black?