Of course, go immediately!
There are many possible reasons for a lump on your testicle. You should see a doctor as soon as possible. See the link below.
Go see a Doctor.
A boy with an undescended testicle should be taken to a doctor as early as possible. See the link below.
A mass on the testicle can be caused from anything from an ingrown hair to a tumor. The only way to know exactly what it is, is to see your doctor.
Any testicle problems should be taken to a doctor. There are many reasons for differences. See the link below.
A Testicle should NEVER swell! If either of yours is swelling, see a Doctor immediately!! It could be Testicular Cancer which can kill you!!
See your doctor.
It could be normal or an infection or something more serious. You should see your doctor.
Mine isn't. If yours is I suggest you see a doctor.
Some testicle problems, like infections and swelling, are treated with antibiotics like Vibrox. See the link below.
When you see your doctor this week, he or she will tell you.
Any change in the size of a testicle should be taken to a doctor. It could be something simple like a swelling from an infection. See Related Links below.