Dragonling
Doesn't do "casual"
Back last year when Sally had that lump under her head, it did end up clearing up on its own after a shed. She has been normal/healthy since. Apart from her doing some head twitching a few weeks ago (which lead me to believe "she" may actually be a male... ha ha poor Sally) she has been completely normal.
Females can be twitchy too. My red factor girl has been in breeding mode this week, crazy active, refusing food, and twitching when I first touch her, particularly after handling my adult male. He was eyeing her through the plastic yesterday, climbing the walls of his bin to get out...poor guy, I didn't mean to tease him.
If the same thing happened last year, it's possible it could just be related to the season. When was her last shed?