I would highly recomend that you ask this question with your doctor as soon as possible, at least if your still underage, talk with either your Mom or Dad. But dont let it go without talking with someone.
If you haven't done something to it that you know of, go to a doctor and find out.
If one testicle is swollen and in pain, it's important that you seek medical care urgently. Call your health care provider and, if s/he is not avialable, go to the emergency department.
It is normal for one testicle to be slightly smaller than the other. The difference in size does not affect fertility.
Many males have a testicle , which is larger then the other one.
Nothing is wrong. In 95% of men, one testicle hangs lower than the other (usually the left one, but not always). Also, in the vast majority of men, one testicle is larger than the other (or smaller than the other - whatever your perspective may be).
Yes
no
Just a little hiccup when you were put together. If you don't have an issue with it and one of them doesn't change, you shouldn't have any problem. Just to make sure, you should have a doctor check and make sure it is in fact a third testicle and not some other growth.
It shouldn't be, the "testicle tubes" on either side should be the same.
No, one testicle always hangs lower than the other. That's normal.
Almost all men have testicles of different sizes; this is completely normal. However, if one testicle is strikingly larger than the other, or if you notice any kind of change in size in either testicle, see a doctor ASAP.
Yes, as long as the testicle is functioning properly then you can reproduce with one testicle.
Yes, he has only one testicle.
Nothing.