Molly has some on her elbows too. She spends all the time laying on the floor where there are like 3 couches and 4 beds to lay on. I guess she just likes the cool floor better. They don't seem to bother her at all. My brothers and I have named them her elephant skin

Astra and Prince don't have any though. They are too 'good' to sleep on the floor. Astra always sleeps on 'her' couch and Prince sleeps on his little corner of the room. It has like 2 big blankets, a pillow, and his regular cat bed.