Will a puntured testicle heal

It will heal, but there is a chance that it could lead to sterility. The testicle is an immunoprotected site. This means that normally your immune system can't get in there. This is important because your sperm only has half of your genetic material, and if your immune system were to see them, it would attack them.

Any time a testicle is punctured, it has a chance of allowing the immune system the ability to attack the sperm.