This is our rescued, 3yr old female Spider Ball named Yzma. We have had her for just over a week.
Her temps are all in range, humidity is great, she's eaten for us, we change her water every other day and spot clean while we are at it. She uses both of her huts and sleeps most of the time, with the occasional day time and evening cruise.

We just took her out tonight and noticed this weird patch on the back of her head. Doesn't look like a bug. Hard to tell if it's raised as she doesn't want her head touched. I saw her rub her head on her tree when she cruised by it today... kinda like, ruuuuuuub, one long rub as she went by.
Can they have moles? Is it part of her pattern? Should I worry?