Looks like it could be a little scratch/rub.
Keep in eye on it and if it gets worse, put some neosporin on it. However, NEVER USE THE NEOSPORIN or any antibacterial cream that has PAINKILLER agent in it. JUST ANTIBIOTICS.
However, I bet that disappears next shed.
Shayna, my albino spider BP had something similar on her head from rubbing or hitting something - maybe the door of her hide when she struck a rat? Two days of neosporin and she was back to normal the next shed.
Good to be cautious and notice these things, but I wouldn't worry too much unless you see it getting worse or see your BP rubbing.