This thread is about my search for any information on a puzzling growth on my chameleon's left side. From a posting (skin issues...what is it...abcess?) I got the closest answer yet. The description and photos are so similar, it must be a vascular tumor. If you see this bump, remove it when it is very small. It does not wall off. It just gets larger, with more blood vessels, making it impossible to remove. His bump has cracked and grown. So don't wait.