Hi. I'm sorry your chameleon is causing you concern. I'm so glad you found this forum because there are people here who are true experts (not me!). I think it would be to your benefit to fill out the "how to ask for help" form. Just click that link, copy the questions, paste them into a reply and add your answers. That will help people help you.
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here is a photo of him. you can see the black underneath his scales on his belly. anyone know if this is burns? or is this just natural?
He could have burnt himself, Pascal (my Veiled) did that when he was about 6 months old. I took him to the vet and she gave us silver sulfadiazine, to put on the burns, it helped him, although his burns were worse, so he had a little bit of scaring on his casque (he burnt off the ridge of it )
He was fine tho, so I'm sure your cham will be fine