I have a panda hamster and she got out on me and i could find her for 3 weeks finally i found her and now she got a hard ball on her cheeks
It seems like your hamster has an impacted cheek. Food as well as other material like bedding might become trapped within the pouch causing the hardball on its cheek. A visit to a vet is required for the condition to be treated.
Might of gotten unknowingly stepped on or had furniture moved against her during your search. Happened to my hamster when he got out forty years ago. Only he couldn't be revived.