For the obsolete dinosaur fossil name, see Megalosaurus § Scrotum humanum. The scrotum is an anatomical male reproductive structure that consists of a suspended dual-chambered sack of skin and smooth muscle that is present in most terrestrial male mammals and located under the penis. One testis is typically lower than the other, which functions to avoid compression in the event of impact.
https://en.wikipedia.org/wiki/Scrotum
Epididymitis is a medical condition characterized by discomfort or pain of the epididymis, a curved structure at the back of the testicle in which sperm matures and is stored.
https://en.wikipedia.org/wiki/Epididymitis
Epididymitis is the most frequent cause of acute onset scrotal pain in adults. In contrast with men who have testicular torsion, the cremasteric reflex (elevation of the testicle in response to stroking the upper inner thigh) is not altered.
https://en.wikipedia.org/wiki/Epididymitis
Epididymitis is usually characterized as either acute or chronic: if acute, the onset of testicular pain is often accompanied by inflammation, redness, and warmth in the scrotum; if chronic, pain may be the only symptom.
https://en.wikipedia.org/wiki/Epididymitis
Things you will need to treat a testicular infection include: 1  Physical examination. 2  Antibiotics. 3  Pain medication.  Warm 1  water. Loose cotton underwear.  See your 1  physician. Take your antibiotics.  Take an over-the-counter pain 1  medication. Take a warm  bath. Wear loose fitting cotton underwear.
http://www.mademan.com/mm/how-treat-testicular-infection.html
Things you will need to treat a testicular infection include: 1  Physical examination. 2  Antibiotics. 3  Pain medication.  Warm 1  water. Loose cotton underwear.  See your physician. Your doctor will need to determine what is causing your symptoms before he can suggest a 1  treatment. Take your antibiotics. Your doctor will give you antibiotics to treat a testicular infection. It is important that you complete your entire course of antibiotics, because if you do not take all of your prescribed medication, your infection may not resolve and could even worsen. Take an over-the-counter pain medication.
http://www.mademan.com/mm/how-treat-testicular-infection.html
Epididymo-orchitis is an inflammation of the epididymis and/or testicle (testis). It is usually due to infection, most commonly from a urine infection or a sexually transmitted infection. A course of antibiotic medicine will usually clear the infection. Full recovery is usual. Complications are uncommon.
https://patient.info/health/epididymo-orchitis-leaflet
This is usually accompanied by a swelling of the lymph nodes in the groin. 3. Penile Pain or Discomfort. Pain, itchiness, or discomfort—often associated with urination—may be a sign of a sexually transmitted infection. 4. Painful Blisters or Scabs on the Penis. A cluster of painful or itchy red spots and small blisters on the penis may be a sign of genital herpes. Typically, the pain or itching comes first, followed a day or two later by the appearance of blisters. Herpes sores may also appear on the scrotum, thighs, and buttocks.
https://www.verywell.com/penis-infection-symptoms-2329018
Back to TopCauses. Disorders associated with testicular infection or pain include epididymitis, orchitis, testicular trauma, and testicular torsion. Epididymitis is an inflammation of the epididymis, the structure that is the first part of the duct draining the testicle. Orchitis is an inflammation of one or both of the testicles.
http://www.nytimes.com/health/guides/disease/testicular-infection-or-torsion/overview.html
what is an infection in testicles called
An infection in the testicles is called Epididymo orchitis.   An  infection in testicles is called Epididymo-orchitis.