She should be brought to a vet. A vet should be able to tell you whether it is cancerous, an infected wound, or a cyst. An infected wound would need to be treated with antibiotics ASAP so go to the vet as soon as you can.
How is she doing otherwise? Is she behaving normally? How old is she?
She's acting healthy. Eats, sleeps, drinks and all. Runs on her week and everything. She acts just like herself. The bump has dried up and shrinked. I have really no clue how but it just happened. She's about a year old!