A testicular abscess is a walled-off pocket of pus inside or immediately around the testicle, almost always the result of a bacterial infection that has gone too far. It is uncommon, developing in roughly 3.5 to 5.5 percent of men with epididymo-orchitis (infection of the epididymis and testicle) who do not receive timely treatment or whose initial treatment fails. Though rare, it is a urological emergency because delayed care raises the risk of losing the testicle entirely.
How a Testicular Abscess Forms
Most testicular abscesses begin as a straightforward infection of the epididymis, the coiled tube that sits behind each testicle. When that infection spreads into the testicle itself, the swelling and fluid buildup can compress tiny blood vessels, choking off oxygen to the surrounding tissue. That oxygen-starved environment is where things escalate: tissue starts to break down, bacteria multiply in the damaged area, and a pocket of pus forms. The progression from simple swelling to a true abscess can happen over days to weeks, depending on how aggressive the bacteria are and how quickly antibiotics are started.1PubMed Central. Acute Epididymo-Orchitis Complicated With Abscesses in Testis and Seminal Vesicles: A Case Report
Not every case follows that path. An abscess can also develop after scrotal surgery, after trauma, or when bacteria reach the testicle through the bloodstream from an infection somewhere else in the body. But the classic route, an undertreated epididymo-orchitis that worsens, accounts for about two-thirds of cases in studies that have tracked the pattern.2IOSR Journal of Dental and Medical Sciences. Causes & Management of Testicular Abscess: Findings of A Study on Eleven Patients
Which Bacteria Are Usually Responsible
The organisms behind a testicular abscess vary with age and sexual activity. In sexually active men under about 35, sexually transmitted bacteria, particularly Chlamydia trachomatis and Neisseria gonorrhoeae, are frequent culprits. In older men, the usual suspects are gut-related bacteria such as Escherichia coli, Klebsiella pneumoniae, and Pseudomonas aeruginosa, often linked to urinary tract infections or recent catheter use. Staphylococcus aureus shows up across all age groups.3Urology Case Reports. Epididymal and testicular abscesses: A case report and review of the literature
When pus from testicular abscesses is cultured, bacteria are identified in roughly two-thirds of samples. In the remaining cases, cultures come back negative, which does not necessarily mean the infection was not bacterial; it may mean antibiotics were started before the sample was collected, or the organism was difficult to grow in standard lab conditions.4IOSR Journal of Dental and Medical Sciences. Causes & Management of Testicular Abscess: Findings of A Study on Eleven Patients
Who Is Most at Risk
Diabetes is the single most consistently reported risk factor. Poorly controlled blood sugar impairs the immune response and promotes infections throughout the body, and the genital area is no exception. Case reports of unusual organisms causing testicular abscesses, including fungal infections, disproportionately involve diabetic patients.5Infectious Diseases in Clinical Practice. Candida Glabrata Testicular Abscess in a Poorly Controlled Diabetic Diabetes is also the primary underlying disorder in Fournier’s gangrene, a catastrophic soft-tissue infection of the scrotum and perineum that a neglected testicular abscess can trigger.6PubMed. A diabetic patient with scrotal subcutaneous abscess
Other factors that raise the odds include:
- Immunosuppression: HIV, organ transplant medications, chemotherapy, or bone marrow transplant all weaken the body’s ability to contain infection locally.
- Urinary tract problems: obstruction from an enlarged prostate, recent catheterization, or structural abnormalities that cause urine to reflux into the reproductive tract.
- Recent surgery or instrumentation: any procedure in or around the urinary tract introduces a small risk of bacterial seeding.
- Advanced age: men over 50 are overrepresented in case series, likely because urinary tract issues and diabetes both become more common with age.
In one review, the average age of patients presenting with testicular abscesses was around 53 years, though cases have been reported in everyone from premature neonates to men in their eighties.7IOSR Journal of Dental and Medical Sciences. Causes & Management of Testicular Abscess: Findings of A Study on Eleven Patients
Symptoms and What They Feel Like
The hallmark is severe scrotal pain, usually on one side, that has been getting worse rather than better despite antibiotics. The scrotum typically becomes red, swollen, and hot. In more advanced cases the skin can break down, with pus draining through the scrotal wall. Fever is common and can be high. One documented case showed a patient arriving with a temperature above 40 °C, rapid heart rate, and low blood pressure, all signs that the infection had become systemic.8PubMed Central. Acute Epididymo-Orchitis Complicated With Abscesses in Testis and Seminal Vesicles: A Case Report
There is an important clinical clue that separates a simple epididymo-orchitis from one that has progressed to an abscess: the failure to improve. A straightforward infection usually starts to feel better within 48 to 72 hours of appropriate antibiotics. If the pain and swelling continue to worsen, or if fever persists despite medication, clinicians begin suspecting an abscess has formed. That deterioration, rather than any single symptom, is the trigger for urgent imaging.
How It Is Diagnosed
Ultrasound is the primary imaging tool. It can show a fluid-filled pocket within the testicular tissue, often with thick walls and debris floating inside. On Doppler imaging, reduced blood flow around the abscess is a concerning finding because it suggests the surrounding tissue is being starved of oxygen. The imaging also helps rule out testicular torsion, which presents with similar acute pain but requires a completely different emergency response.
One challenge with ultrasound is that a testicular abscess can look alarmingly similar to a testicular tumor. Both can appear as a mass with irregular borders and mixed internal echoes. In one reported case, a 41-year-old man was treated for suspected epididymitis, but when antibiotics failed and the testicle was removed, pathology revealed a seminoma (a type of testicular cancer) that had become secondarily infected with Salmonella.9PubMed Central. A case of testicular seminoma with testicular abscess caused by Salmonella saintpaul This overlap means that when imaging is ambiguous and the patient does not respond to treatment, surgical exploration and tissue analysis become necessary to rule out cancer.
Treatment and the Goal of Saving the Testicle
Treatment starts with broad-spectrum intravenous antibiotics designed to cover both common aerobic bacteria and anaerobic organisms. The choice of antibiotic is adjusted once culture results come back, but the initial goal is to hit a wide range of likely pathogens. Antibiotics alone, however, are often not enough once a true abscess has formed. Pus walled off inside a cavity does not receive adequate blood flow, which means antibiotics circulating in the bloodstream cannot reach the bacteria inside the pocket effectively. That is why drainage, whether through a needle guided by ultrasound or through an open surgical incision, is usually required.10Urology Case Reports. Pediatric intratesticular abscess managed with a testicular sparing approach: A case report
The encouraging finding from accumulated case reports is that testicle-sparing surgery works the majority of the time when performed early enough. One review found that incision and drainage successfully preserved the testicle in nearly nine out of ten patients, avoiding the need for removal altogether.11Urology Case Reports. Pediatric intratesticular abscess managed with a testicular sparing approach: A case report Even in cases where a large abscess appeared to replace the entire testicle on imaging, carefully draining the pus and following up with targeted antibiotics has allowed some patients to keep a functional testicle.12PubMed Central. Brucellar testicular abscess: The 17th case report and review of literature
Removal of the testicle (orchiectomy) becomes necessary when the tissue is too damaged to save, when the abscess has ruptured into the scrotum creating a collection of pus called a pyocele, or when cancer cannot be excluded based on imaging alone. A ruptured abscess in particular calls for prompt surgical exploration, and if the testicle itself has burst, removal is generally the safest option.13PubMed. Pyocele of scrotum: consequence of spontaneous rupture of testicular abscess
Potential Consequences if Treatment Is Delayed
The most immediate concern is losing the testicle. In a study of patients hospitalized for acute epididymo-orchitis, about 6 percent had an abscess visible on ultrasound, and the presence of an abscess was significantly associated with the need for orchiectomy. Overall, roughly 5 percent of patients in that cohort experienced loss or atrophy of a testicle.14PubMed Central. Outcome of acute epididymo-orchitis: risk factors for testicular loss
Fertility is a longer-term worry. Infections within the testicle can damage the delicate structures where sperm are produced. Up to a quarter of testicular biopsies from men being evaluated for infertility show evidence of focal inflammation, and research consistently links the presence of immune cells and inflammatory chemicals in the testicle with reduced sperm quality.15PubMed Central. Urogenital Infection as a Risk Factor for Male Infertility Whether a single episode of testicular abscess significantly reduces a man’s future fertility depends on the severity of the infection, how quickly it was treated, and whether the other testicle is healthy. For men concerned about fertility after recovery, a semen analysis a few months later is a reasonable step.
The most dangerous progression is Fournier’s gangrene, a rapidly spreading, life-threatening infection of the scrotal and perineal soft tissue. Elderly men with diabetes and other coexisting illnesses are at highest risk. In one case series, three elderly diabetic patients with scrotal abscesses caused by Klebsiella pneumoniae were described, and two of the three progressed to Fournier’s gangrene.16PubMed Central. Scrotal abscess and Fournier gangrene caused by Klebsiella pneumoniae: a case series and literature review This outcome underscores why worsening scrotal infection in a diabetic patient should never be managed with a wait-and-see approach.
Testicular Abscesses in Neonates and Children
Though rare, testicular abscesses do occur in newborns and young children, and the presentation often looks nothing like it does in adults. A neonate will not complain of scrotal pain; instead, the clues are non-specific: poor feeding, jaundice, abdominal distension, or a new scrotal mass noticed during a diaper change. In one classic case, an infant developed a firm, tender scrotal mass on the fourteenth day of life during treatment for E. coli bloodstream infection. Blood cultures had already turned positive days earlier, and the bacteria had seeded the testicle through the bloodstream.17JAMA Pediatrics. Scrotal Mass in a Neonate: Testicular Abscess
Premature infants are especially vulnerable because of their underdeveloped immune systems and prolonged hospital stays involving intravenous lines and catheters. In these babies, even organisms rarely seen in adults, such as Candida albicans, can cause bilateral scrotal abscesses.18PubMed Central. An unusual cause of bilateral scrotal abscess in a preterm infant: Candida albicans In the pediatric population, the emphasis is strongly on testicle-sparing approaches whenever possible, because the long-term consequences of losing a testicle early in life are more significant for growth, hormonal development, and future fertility.
Tuberculosis as a Hidden Cause
In regions where tuberculosis is common, TB can involve the testicle and produce an abscess that closely mimics a tumor or a routine bacterial infection. Testicular TB is a rare form of genitourinary tuberculosis, but it is well documented. It typically presents as painless or mildly painful testicular swelling that develops over weeks or months, sometimes with a draining sinus in the scrotal skin. Infertility can be a presenting complaint.19PubMed Central. A rare case of isolated testicular tuberculosis and review of literature
What makes TB-related testicular abscesses tricky is that standard ultrasound findings overlap with those of cancer: irregular borders, mixed echoes, areas of reduced blood flow. Culture of pus may reveal acid-fast bacilli, but often the diagnosis is not confirmed until the tissue is examined under a microscope, showing the hallmark granulomas with central necrosis. In most cases, genital TB accompanies kidney or lower urinary tract involvement, but isolated testicular TB without any other organ involvement has been reported and confirmed on biopsy.20PubMed Central. Isolated Tuberculous Testicular Abscess Without Systemic Involvement: A Rare Cause of Scrotal Swelling
Because of this diagnostic challenge, clinicians working in TB-endemic areas maintain a high index of suspicion for any chronic testicular mass that does not respond to standard antibiotics. A history of prior pulmonary TB, even years in the past, raises the likelihood of late reactivation in the testicle.21Urology Case Reports. Unilateral testicular abscess: A rare manifestation of late-stage reactivation of extrapulmonary tuberculosis When TB is identified, treatment shifts to a months-long anti-tuberculosis drug regimen rather than routine antibiotics, and orchiectomy can sometimes be avoided.
Other Unusual Organisms
Beyond the common bacteria and TB, testicular abscesses have been caused by organisms most clinicians would not think to test for in the scrotum. Brucella, a bacterium transmitted through unpasteurized dairy or contact with infected livestock, can cause testicular abscesses that masquerade as tumors. In reported cases, brucellar abscesses have been successfully treated with drainage and a prolonged course of antibiotics (typically doxycycline and rifampicin for six weeks), with imaging showing complete resolution of the abscess afterward.22Turkish Journal of Emergency Medicine. Brucellar Testicular Abscess Presenting as a Testicular Mass: Can Color Doppler Sonography be used in Differentiation? Even large multilocular brucellar abscesses that appeared to replace the entire testicle have been managed with organ-sparing drainage and targeted antibiotics rather than immediate removal.23PubMed Central. Brucellar testicular abscess: The 17th case report and review of literature
Fungal testicular abscesses, while very uncommon, tend to occur in people with severe immune compromise or uncontrolled diabetes. Candida glabrata has been documented as the cause of a testicular abscess in a diabetic patient, a finding that would be missed by standard bacterial cultures.24Infectious Diseases in Clinical Practice. Candida Glabrata Testicular Abscess in a Poorly Controlled Diabetic Salmonella species, more commonly associated with food poisoning, have caused testicular abscesses both in immunocompromised adults and in a case where the bacteria colonized a pre-existing testicular tumor.25PubMed Central. A case of testicular seminoma with testicular abscess caused by Salmonella saintpaul These unusual organisms are a reminder that when a testicular abscess does not respond to standard treatment, expanding the microbiological workup beyond routine cultures can be the difference between saving and losing the testicle.
What Recovery Looks Like
After drainage and antibiotic treatment, follow-up imaging is typically performed weeks to a few months later to confirm the abscess has resolved. In documented cases, repeat ultrasound has shown complete resolution of the infection, sometimes leaving only a small area of scar tissue within the testicle. The antibiotic course length varies with the organism; standard bacterial abscesses may require two to four weeks, while TB and brucellosis need months of targeted therapy.
During recovery, patients are usually advised to rest, wear supportive underwear, and watch for any return of fever, swelling, or redness that could signal a recurrence or incomplete drainage. For men who have retained the testicle, a follow-up physical exam to assess testicular size and consistency helps catch late atrophy, which developed in a small percentage of patients in outcome studies even after apparently successful treatment.26PubMed Central. Outcome of acute epididymo-orchitis: risk factors for testicular loss For younger men and those hoping to have children, a semen analysis several months after recovery provides a concrete measure of whether the infection left lasting damage to sperm production.