Recurring perianal abscesses almost always point to an underlying problem that simple drainage doesn’t fix. The most common reason is a tiny tunnel called a fistula connecting the inside of your anal canal to the skin outside, which acts as a persistent pathway for infection. Between 25% and 50% of people who have an anorectal abscess drained will either develop a fistula or experience a recurrence, and in many cases those two outcomes are linked.
The Gland Infection That Starts the Cycle
The inside of your anal canal has small glands that open into little pockets along the lining. These glands normally drain harmlessly, but when one gets blocked, bacteria from stool can get trapped inside. The blocked gland swells with infected fluid, and that infection spreads outward through the layers of muscle surrounding the anus, eventually forming a painful, pus-filled pocket near the skin surface. That pocket is the abscess you feel.
Draining the abscess relieves the pain and clears the acute infection, but it doesn’t necessarily address the blocked gland where everything started. If that original gland remains diseased or a channel of infected tissue persists between the gland and the skin, bacteria have a ready-made path to re-infect the area. This is how a fistula forms: a small, chronic tunnel that keeps the cycle going. Once a fistula exists, infected material continues to seep through it, and new abscesses can form at either end or along its length.
Fistulas: The Most Common Culprit
About one-third of anorectal abscesses are accompanied by a fistula at the time of the initial drainage. Many others develop a fistula in the weeks or months afterward. If your abscesses keep returning in roughly the same spot, a fistula is the most likely explanation. The abscess gets drained, the surface heals over, but the tunnel underneath never closes. Pressure builds again, and a new abscess appears.
Standard incision and drainage alone doesn’t treat the fistula. A procedure called fistulotomy, which opens the tunnel so it can heal from the inside out, is often needed to break the cycle. In one long-term study, patients who had drainage combined with fistulotomy had a 0% recurrence rate, compared with roughly 5.5% recurrence in those who had drainage alone. The challenge is that fistulotomy isn’t always safe to perform during an acute infection, and complex fistulas involving a lot of sphincter muscle require more specialized repair to avoid affecting continence.
If you’ve had multiple abscesses drained but nobody has specifically looked for a fistula, that’s the most important next step. MRI and endoanal ultrasound both detect fistulas with about 87% sensitivity. MRI tends to be better at ruling out a fistula when one isn’t present and is generally preferred for mapping complex tracts before surgery.
Crohn’s Disease and Other Inflammatory Conditions
Recurring perianal abscesses can be an early sign of Crohn’s disease, sometimes appearing years before any gut symptoms. Up to 43% of people with Crohn’s develop perianal fistulas and abscesses, and in about 5% of cases, the perianal problems are the only sign of the disease with no obvious intestinal inflammation at all. In nearly half of Crohn’s patients who develop perianal disease, the abscesses and fistulas appear at the same time as or even before the Crohn’s diagnosis.
Certain patterns raise suspicion for Crohn’s. Multiple fistula openings, wide or irregularly shaped openings, rectal inflammation seen on examination, and large fleshy skin tags around the anus are all characteristic. If you’re also dealing with chronic diarrhea, abdominal cramping, unexplained weight loss, or blood in your stool, your doctor should evaluate you for inflammatory bowel disease. Even without those symptoms, repeated abscesses that don’t respond to standard surgical treatment warrant further investigation.
Hidradenitis Suppurativa
Another condition that causes recurring boil-like lumps in the perianal and groin area is hidradenitis suppurativa, a chronic skin disease affecting hair follicles and sweat glands. It can look very similar to perianal abscesses but has some distinguishing features. The lumps in hidradenitis tend to be more superficial, appear on both sides of the buttocks or groin (rather than right next to the anal opening), and often extend to the buttock creases or sacral area. If your recurring lumps are bilateral, sit more on the surface, and aren’t centered directly on the anus, hidradenitis is worth discussing with a dermatologist or surgeon.
Diabetes and Metabolic Risk Factors
Poorly controlled diabetes significantly increases the chance of abscess recurrence. In a four-year study of patients with type 2 diabetes, those with long-term blood sugar levels above a certain threshold (HbA1c over 7.5%) were 2.7 times more likely to have their abscess come back. Poorly controlled blood sugar was the single strongest independent predictor of recurrence in the study, outweighing other factors. Metabolic syndrome, which involves a combination of high blood sugar, high blood pressure, excess abdominal fat, and abnormal cholesterol, was also an independent risk factor.
This makes sense biologically. High blood sugar impairs your immune system’s ability to fight infection and slows wound healing. If you have diabetes and keep getting abscesses, tightening your blood sugar control is one of the most concrete things you can do to reduce recurrence. It won’t fix an underlying fistula, but it can make the difference between a wound that heals cleanly and one that becomes re-infected.
What Happens After Drainage Matters
How your wound is managed after drainage also plays a role. Traditionally, the cavity left after an abscess is drained gets packed with gauze strips that are changed daily, with the idea that packing prevents the surface from closing before the deeper tissue heals. This is painful and time-consuming. A systematic review pooling data from multiple studies found no significant difference in abscess recurrence or fistula formation between packed and unpacked wounds. If your provider still recommends packing, it’s reasonable to ask about alternatives like loose wicks or no packing at all, since the evidence doesn’t support a clear benefit.
What does matter is keeping the wound clean, allowing it to heal gradually from the inside, and following up to check for fistula formation. Many recurrences happen because the skin seals over too quickly, trapping bacteria underneath, or because a developing fistula goes undetected during the recovery period.
Warning Signs of a Dangerous Progression
Most recurrent abscesses are painful and frustrating but not life-threatening. Rarely, a perianal infection can spread into the deeper tissue layers and become a condition called Fournier’s gangrene, a type of necrotizing soft tissue infection. Early signs include redness spreading beyond the abscess area (particularly up toward the groin), skin that feels crackly to the touch, foul-smelling drainage, skin darkening or turning dusky, and fever with fatigue that seems out of proportion to the size of the abscess. People with diabetes, HIV, or obesity are at higher risk. Rapid worsening despite treatment, especially with spreading redness and systemic symptoms like high fever or confusion, requires emergency care.
Breaking the Cycle
If you’ve had two or more perianal abscesses, the path forward typically involves three things: imaging to look for a fistula tract, evaluation for underlying conditions like Crohn’s disease (especially if you have any digestive symptoms or unusual features around the fistula openings), and addressing metabolic risk factors like blood sugar control. Simple repeated drainage without investigating the cause is unlikely to stop the cycle. A colorectal surgeon, rather than an emergency department, is usually the right specialist to coordinate this workup, since they can both image the area and perform definitive surgical repair if a fistula is found.