Sand is no good. You want to dump it ASAP and switch it out for paper towels for now and then to a safer substrate like tile, reptile carpet, non adhesive shelf liner or newspaper. Sand is unsanitary and can impact your beardie if he ingests it, which is almost impossible to avoid since they lick everything and get it in their mouth when they catch their food.
Do you only have one white light? Is it a regular bulb or is it coil or as long tube?
A UVB source is absolutely necessary. They need UVB to survive, to absorb calcium and will get metabolic bone disease without one.
The red light should be turned off as well. They need a bright white basking light during the day, a regular old household bulb works fine, and at night they need complete darkness to sleep. If your house doesn't go below 65 at night you don't need any light and if it does a ceramic heat emitter which puts only heat out and no light should be used.
To post a pic you can use photobucket. Make an account, upload your pics to the site and them copy and paste the IMG code into your post on here.
My first guess about the bump is possibly an irritation from the sand. Thats another reason sand is no good, it easily gets into their eyes. Once you post a pic we will be able to tell better.
Do you use calcium and vitamin powder? These are also necessary. Unfortunetly petstores seem to give out wrong information, or none at all.