Hi , I felt on my right testicle a lump

Patient: Hi , I felt on my right testicle a lump , (Very small lump). Then I felt back pain and on the stomach. also In both of my legs . could it be Cancer. I’m Worried, Just resently took Blood test and Booked A ultra- thing. I’m just 15 plz answer me

Symptoms: Lump, back pain and leg pain

Doctor: