Testicular and groin tumors are growths that occur inside the testicles or around the groin area in boys. These can either be benign (non-cancerous) or malignant (cancerous). Such tumors are most often seen in boys under the age of five years old, and sometimes appear in boys that go through early puberty. A painless bump in the testicles or a dull ache or heaviness in the scrotum are all symptoms of testicular and groin tumors. Most testicular tumors are benign but still require an operation to be removed. Malignant tumors can spread to other parts of the body (most commonly the lungs, liver, lymph nodes and central nervous system), so early detection is important.