Of course you should be worried about a lump in your scrotum. It is advised that men should examine their scrotum and testicles monthly to check for lumps as they could be cancerous. You should have a doctor check it out.
Some lumps are lymph nodes, which you have lots of in your groin. Some lumps can be worry some. If you think it is out of place of it causes you pain, see a doctor.
This is a common sign of testicular cancer. Only a doctor can tell if it is cancer or something benign, which is also possible, so you should be evaluated immediately.
Yes. Any unusual lump, coloration, or solid mass should be seen by a doctor. It could be anything from an infection to cancer. Have it checked out by a doctor.