Can you give us some more information? Do you mean the lighting, the rocks or sand or even the food? Is there something specifically wrong with your lizard? What kind of lizard do you have, and what size terrarium?

It's my son science project question.I think it the color of the terrarium

We don't answer home work questions, but there is a section specifically for homework HELP, where some of us may be able to HELP you find the answer. But we won't do your son's homework for him... and neither should you!

I'm just triying to find for him a helpful web that he can start from

I didn't ask you to do my son homework .I'm just triying to find a helpful web.

Try this. Reptile Skin Basics (http://www.anapsid.org/basicdermatology.html)
We only know what you tell us, and your question wasn't very clear.

This is the pet section, not the homework section. The only way we can help is if you actually have a lizard, and actually need help with that lizard.

Try putting this in the homework section, but be warned, as Bella said, we don't just give answers here. We can help, but your son has to put in the effort to find the answer. We can only lead him in the right direction after he's posted what he thinks the answer is.

Since this isn't an actual question about an actual lizard, I'm closing the thread. The OP can re-post in the homework section.