In medical terms, excision means the surgical removal of tissue, a growth, or a part of the body. It differs from an incision, which is simply a cut into tissue. When a surgeon performs an excision, the goal is to take something out entirely, whether that’s a mole, a cyst, a tumor, or a section of damaged tissue.
Excision vs. Incision
These two terms sound similar but describe very different things. An incision is a cut made to access something, like the opening a surgeon makes to reach an organ. An excision is the actual removal of tissue. Think of it this way: a surgeon makes an incision (a cut) in order to perform an excision (a removal).
This distinction matters most in biopsies. In an excisional biopsy, the entire lump or suspicious area is removed and sent to a lab. In an incisional biopsy, only a small portion of the abnormal tissue is cut away for testing. Excisional biopsies are more common when the growth is small enough to remove completely or when your doctor wants the full picture of what’s going on inside the tissue.
Why Excisions Are Performed
Excisions serve two broad purposes: treatment and diagnosis, sometimes both at once. The most common reasons include removing skin cancers (basal cell carcinoma, squamous cell carcinoma, melanoma), cutting out benign growths like cysts and lipomas, and taking biopsies of suspicious tissue. Skin lesions like warts, skin tags, and age-related growths called seborrheic keratoses are also frequently excised.
In cancer treatment, excision is often the first line of defense. The surgeon removes the tumor along with a border of healthy-looking tissue around it, called the surgical margin. For skin cancers like basal cell or squamous cell carcinoma, this margin is typically 3 to 4 millimeters. For a suspected melanoma, the initial margin is usually 2 to 3 millimeters, with a wider re-excision if the diagnosis is confirmed.
What Surgical Margins Mean for You
After an excision, a pathologist examines the removed tissue under a microscope, paying close attention to the edges. If no cancer cells are found at the edges, the margin is called “negative” or “clear,” which means the surgeon likely got all of the cancer. If cancer cells are present right at the edge, the margin is “positive,” and a second procedure may be needed. Sometimes a pathologist will report a “close margin,” meaning cancer cells are within 1 to 5 millimeters of the edge. A clear margin significantly reduces the chance that cancer will return in the same spot.
What the Procedure Feels Like
Most skin excisions are outpatient procedures done under local anesthesia. Your doctor injects a numbing agent, typically lidocaine, into the area around the tissue being removed. You’ll feel pressure but not pain. In some cases, a longer-acting numbing agent is mixed in so the area stays comfortable after the procedure. For areas with strong blood flow, the numbing solution may include a medication that temporarily narrows blood vessels, reducing bleeding. This particular mixture is never used on fingers, toes, or the nose, where restricting blood flow could cause tissue damage.
For skin excisions, the surgeon uses a scalpel to cut around and beneath the targeted tissue. Deeper excisions inside the body may require specialized tools like electrocautery devices, which use heat to cut and seal tissue simultaneously, or ultrasonic scalpels. After the tissue is removed, the wound is typically closed with stitches.
Mohs Surgery: A Specialized Excision
Standard excision removes the visible growth plus a uniform margin of normal tissue in every direction. Mohs micrographic surgery takes a more precise approach. The surgeon removes one thin layer of tissue at a time, examines it under a microscope immediately, and only takes more tissue from the specific areas where cancer cells remain. This process repeats until no more cancer is detected.
The practical difference is significant. Standard wide excision removes a larger, deeper area of tissue and examines roughly 1% of the margin under a microscope. Mohs surgery examines 100% of the margin, which means it catches cancer cells that standard methods might miss while preserving far more healthy skin. The tradeoff is time: Mohs procedures take longer because each layer is analyzed during the surgery itself. It’s most commonly used for skin cancers on the face, ears, and hands, where preserving tissue matters most.
Recovery After an Excision
Healing follows a predictable four-stage process. Within the first 30 minutes to few days, the wound stops bleeding and a clot forms. Over the next several days, the area becomes inflamed as your immune system cleans out damaged cells and guards against infection. This redness and swelling is normal and expected.
During the third stage, the wound visibly shrinks. New tissue fills in the gap and the edges pull together, gradually closing the wound. This proliferation phase is when you’ll notice real progress. The final stage, remodeling, begins in the early weeks but continues for up to a year. During this time, the scar tissue strengthens and softens, though it never becomes quite as strong as the original skin.
For a small skin excision, most people return to normal activities within a few days, though the wound site needs to be kept clean and protected. Larger or deeper excisions require longer recovery depending on the location and the amount of tissue removed.
Possible Complications
Minor excisions carry relatively low risk, but no surgical procedure is without potential complications. The most common issues are infection, bleeding or bruising at the site, and wound dehiscence, which is when the wound reopens along the stitched line. Scarring is inevitable with any excision, though its severity depends on the size of the removal, the location on your body, and your individual healing tendencies. Nerve damage causing temporary or permanent numbness near the excision site is possible but uncommon in routine procedures.
Signs that something isn’t healing properly include increasing redness or warmth around the wound after the first few days, pus or foul-smelling drainage, fever, or edges of the wound pulling apart. These warrant a call to your surgeon’s office.