I think my cat scratched my chin

I left my sister to watch my chin yesterday while I was on a trip and came home to notice that Jasper was acting odd. He's staying on his chinchiller in the corner and has tiny patches of fur pulled out. He's usually very active and lively but he hasn't left the top section of his cage so I've been putting a few treats, hay, etc. up there to make sure he gets them. Jasper barks at me when I go to pet him or even put my hand near him :/ he isn't squeaking or being his usual social self...

I made a temporary structure to keep the cats away from the cage but I'm not sure what to do about Jasper. Any advice is appreciated!!!