1. Since your are able to walk and run normally without pain & restriction - probably you wont be suffering from any bony injury
2. Pain only when your knee / patella
bone comes into contact indicates inflammation / injury to your bursa present before the patella bone - Pre-patellar bursitis
3. Crepe bandage with restriction of activities leading to pain for 3 weeks usually will resolve your problem,
4. If the part becomes red, swollen, more painful on touching then you need to get your knee examined by orthopaedic surgeon
to rule-out infection of the bursa.