An I&D surgery, short for incision and drainage, is a procedure where a doctor cuts open an abscess and drains the pus trapped inside. It’s the primary treatment for skin and soft tissue abscesses, and it’s one of the most common minor procedures performed in emergency departments and outpatient clinics. Antibiotics alone aren’t enough to clear most abscesses, so this hands-on approach is typically necessary.
Why Abscesses Need to Be Drained
An abscess is a pocket of pus that forms beneath the skin, usually from a bacterial infection. The body walls off the infection, creating a pressurized collection of fluid, dead tissue, and bacteria in the deeper layers of skin. That walled-off pocket is exactly why antibiotics struggle to reach it. The drug can’t penetrate well into a sealed-off cavity full of debris. Draining the pus removes the bulk of the infection and gives the body (and any prescribed antibiotics) a chance to finish the job.
Common reasons people need an I&D include boils, carbuncles (clusters of boils), infected cysts, and abscesses caused by ingrown hairs or minor skin wounds. Abscesses from MRSA, a drug-resistant staph bacteria, are increasingly common and almost always require drainage.
What Happens During the Procedure
The area around the abscess is first cleaned and then numbed with a local anesthetic injected into the surrounding skin. This is often the most uncomfortable part, since inflamed tissue doesn’t respond to numbing agents as well as healthy tissue does. Some providers also offer sedation for larger or more painful abscesses, though most I&D procedures are done with local anesthesia alone.
Once the area is numb, the doctor makes a small cut over the abscess. Pus drains out immediately, and the doctor may gently press around the cavity to help evacuate remaining fluid, dead tissue, and debris. For deeper abscesses, they may use a small instrument to break up internal walls (called loculations) so all the pus can escape. The entire procedure typically takes 10 to 20 minutes, depending on the size and location of the abscess.
Why Doctors Sometimes Pack the Wound
After draining the pus, your doctor may place a strip of gauze inside the open wound. This is called packing, and it serves a few purposes: it keeps the wound from closing over too quickly on the surface while the deeper cavity still needs to heal from the inside out. Some packing material is treated with iodoform, an antiseptic that slowly releases iodine to kill bacteria, break down dead tissue, and encourage new tissue growth. The gauze also absorbs fluid and helps prevent the pocket from refilling with pus.
Not every abscess needs packing. Smaller, shallow abscesses may be left open to drain on their own. Your doctor will let you know whether you need to return for packing removal or replacement, which is usually done within one to three days.
Do You Need Antibiotics Afterward?
For straightforward abscesses, drainage alone is often the complete treatment. Antibiotics are added when there are signs that the infection is spreading beyond the abscess itself. The Infectious Diseases Society of America recommends basing that decision on whether you’re showing signs of a body-wide inflammatory response: fever above 100.4°F, rapid heart rate above 90 beats per minute, or rapid breathing. Antibiotics active against MRSA are recommended if you’ve failed a previous course of antibiotics, have a weakened immune system, or show signs of severe infection with low blood pressure.
If the skin around the abscess is red, warm, and spreading (cellulitis) but there’s no pus pocket to drain, antibiotics targeting strep bacteria are the usual first step. Your doctor will decide based on how the infection looks and how you’re feeling overall.
Recovery and Wound Care
Full healing after an I&D takes between 6 and 12 weeks, though the wound will feel significantly better within the first few days as the pressure and infection resolve. The wound is intentionally left open to heal from the inside out, which means you’ll need to care for it at home during that time.
Daily wound care involves cleaning the site with fresh, clean water, patting it dry with a clean towel or gauze, and applying a fresh dressing to absorb any fluid that continues to drain. If packing was placed, you’ll likely need to return to have it changed or removed. Some people are taught to change the packing themselves at home. Expect some drainage and mild discomfort for the first week or two, gradually tapering off as the cavity fills in with new tissue.
Risks and Warning Signs
I&D is a low-risk procedure, but complications can occur. The most common issue is recurrence. Abscesses can come back in the same spot if the cavity wasn’t fully drained or if the underlying cause (like an ingrown hair or chronic skin condition) isn’t addressed. Scarring at the incision site is expected, though it’s usually small.
Signs that something isn’t healing properly include worsening redness spreading outward from the wound, increasing pain after the first couple of days, fever, chills, or rigors (uncontrollable shaking). These can indicate that the infection is progressing or that bacteria have entered the bloodstream, which requires urgent medical attention.
Why You Shouldn’t Drain an Abscess at Home
It’s tempting to squeeze or lance an abscess yourself, but doing so can push bacteria deeper into surrounding tissue or spread the infection to other areas of skin. A clinical I&D uses sterile instruments, proper anesthesia, and techniques to fully evacuate the cavity and break up internal pockets that a needle or squeeze at home simply can’t reach. Cleveland Clinic specifically warns against attempting home drainage for these reasons.
Where It’s Done and What It Costs
Most I&D procedures happen in urgent care clinics, emergency departments, or outpatient surgery centers. You generally don’t need to go to a hospital operating room unless the abscess is very large, deep, or in a location that requires sedation. For Medicare patients, the average out-of-pocket cost is about $165 at an ambulatory surgery center and $278 at a hospital outpatient department. Costs vary widely based on your insurance, the complexity of the abscess, and where you have it done. Emergency room visits tend to be the most expensive option for a straightforward abscess that could be handled at urgent care.