Electrodesiccation and curettage, abbreviated ED&C, is one of the most common in-office procedures in dermatology. It involves scraping away abnormal skin tissue with a sharp, spoon-shaped instrument called a curette, then applying a low-power electrical current to the base of the wound to destroy remaining abnormal cells and stop bleeding. The procedure has been a workhorse for treating both benign growths and certain skin cancers for well over half a century, and it remains popular because it is fast, effective for the right types of lesions, and requires no stitches.
How the Procedure Actually Works
ED&C is a two-part technique, and understanding each part helps explain why they are paired together. The first step is curettage. Your dermatologist uses a curette, a small instrument with a round, sharp-edged loop at the tip, to scrape away the abnormal tissue. Cancerous or otherwise abnormal skin tends to be softer and more friable than healthy skin, so the curette can distinguish the two by feel. A skilled operator scrapes until the curette meets the firmer resistance of normal tissue underneath.
The second step is electrodesiccation. An electrode applies a high-frequency electrical current to the scraped area. This current heats the tissue, causing proteins to break down and water to evaporate from the cells, a process that essentially dries out and destroys a thin layer of remaining tissue at the wound base.1PubMed. Electrosurgery: part I. Basics and principles The heat also seals small blood vessels, which is why the procedure produces minimal bleeding. Electrodesiccation specifically uses high-voltage, low-amperage current, which keeps the tissue damage relatively superficial rather than penetrating deeply.2Operative Techniques in Otolaryngology-Head and Neck Surgery. Electrodessication and curettage for low-risk cutaneous malignancies of the head and neck
In most treatment protocols for skin cancer, this scrape-then-burn cycle is repeated two or three times in the same session. Each pass removes a little more abnormal tissue and extends the zone of thermal destruction slightly deeper. The entire process typically takes about 15 to 20 minutes per lesion and is performed under local anesthesia, so you feel pressure but not pain during the procedure itself.
What ED&C Is Used For
The list of conditions treated with ED&C breaks into two broad categories: skin cancers and benign growths.
For skin cancer, ED&C is considered appropriate for superficial and low-risk basal cell carcinomas (BCCs) and squamous cell carcinomas (SCCs). “Low-risk” generally means the tumor is small, is not a recurrence of a previously treated cancer, and sits in an area of the body where the skin is relatively thick and flat, like the trunk or extremities. Superficial BCCs and SCCs that are limited to the upper layers of the skin can be treated adequately with ED&C.3PubMed. Nonmelanoma skin cancer The procedure has been described as probably the most widely used office method for skin cancer treatment in dermatology, a characterization that dates back decades and still holds in many practice settings.4JAMA Dermatology. Curettage and Electrodesiccation in the Treatment of Skin Cancer
On the benign side, ED&C is commonly used to remove seborrheic keratoses, those waxy, stuck-on-looking brown spots that become increasingly common with age. These are among the most frequent benign tumors dermatologists see, and electrodesiccation is one of the two go-to removal methods alongside cryotherapy (freezing).5PubMed Central. Patient Preferences and Comparative Outcomes Regarding Cryosurgery versus Electrodesiccation in the Removal of Truncal Seborrheic Keratoses Other benign conditions treated with electrodesiccation include warts, skin tags, pyogenic granulomas, and certain types of angiomas. For many of these, the full curettage-plus-desiccation cycle is not necessary; sometimes light electrodesiccation alone (sometimes called hyfrecation, after a brand name of the device) is enough.
Where ED&C Should Not Be Used
The procedure has clear boundaries, and knowing them matters because using ED&C on the wrong type of lesion leads to significantly worse outcomes. Several situations make it a poor choice:
- High-risk tumors: Skin cancers that are large, deeply invasive, recurrent after a previous treatment, or show aggressive features under the microscope should be treated with surgical excision or Mohs micrographic surgery instead, because these methods allow pathological examination of the tissue margins to confirm complete removal.3PubMed. Nonmelanoma skin cancer
- The H-zone of the face: This refers to the central face, including the nose, the areas around the eyes, ears, and lips. Skin cancers in these zones have higher recurrence rates with ED&C because the anatomy is complex, with folds and cartilage that make it harder to scrape uniformly. Dermatologists are substantially less likely to use ED&C in the H-zone.6International Journal of Women’s Dermatology. Surveyed dermatologists are less likely to curette invasive squamous cell carcinoma in solid organ transplant recipients
- Immunosuppressed patients: People who have received organ transplants or are on medications that suppress the immune system develop more aggressive skin cancers. Dermatologists are more cautious about using ED&C on these patients, even for tumors that would qualify as low-risk in someone with a normal immune system.6International Journal of Women’s Dermatology. Surveyed dermatologists are less likely to curette invasive squamous cell carcinoma in solid organ transplant recipients
- Areas where cosmetic outcome is critical: ED&C heals by secondary intention, meaning the wound fills in on its own without stitches. This leaves a round, flat, often slightly pale or depressed scar. On the trunk or legs, most people accept this easily. On visible areas like the face, the cosmetic result is less predictable, and excision with sutures often produces a thinner, less conspicuous scar.
The general guiding principle is that ED&C works best on well-defined, superficial, primary (not recurrent) tumors in locations where the skin is thick and relatively flat. The further a lesion deviates from that profile, the less suitable the procedure becomes.
How Well It Works
Recurrence rates for ED&C compare favorably with other treatments when the procedure is used on appropriate lesions. A prospective cohort study that tracked over 600 nonmelanoma skin cancers found a five-year recurrence rate of about 1.8% after ED&C, compared with 4.0% after standard surgical excision and 2.6% after Mohs surgery.7PubMed Central. Recurrence After Treatment of Nonmelanoma Skin Cancer: A Prospective Cohort Study Those numbers might seem counterintuitive, since Mohs surgery is considered the gold standard for skin cancer removal. But the explanation lies in case selection: the tumors treated with ED&C were the easiest ones, while Mohs surgery was reserved for the trickiest. Within each group of tumors, the treatment matched the difficulty of the case, and the outcomes reflected that appropriate matching.
The takeaway is not that ED&C is “better” than excision or Mohs. It is that when a tumor is truly low-risk and superficial, a relatively simple technique does an excellent job. Where outcomes go wrong is when ED&C gets used on lesions that call for a more involved approach.
Operator Skill Makes a Measurable Difference
One thing that distinguishes ED&C from excisional surgery is how much the outcome depends on the operator’s feel and judgment. With surgical excision, the pathologist examines the removed tissue and can tell whether the margins are clear. With ED&C, there is no specimen to send for margin analysis. The dermatologist relies on tactile feedback from the curette to judge when all abnormal tissue has been removed. That judgment improves with experience, and the data on this point is striking.
A study examining recurrence rates found that when ED&C was performed by dermatology residents, the five-year recurrence rate for basal cell carcinoma was roughly 19%. When a supervision program was put in place, that rate dropped to about 10%. The lowest recurrence rates, around 6%, were achieved by fully trained dermatologists working in private practice.8Actas Dermo-Sifiliográficas. Response to the Article: “Efficacy of Curettage-Electrodesiccation for Basal Cell Carcinoma in Medium- and High-Risk Areas” This threefold difference based on training level underscores that ED&C is a skill-dependent technique. If you are having a skin cancer treated with ED&C, the experience of the person holding the curette genuinely matters.
What to Expect During and After the Procedure
Before starting, your dermatologist injects a local anesthetic (usually lidocaine) into and around the treatment site. Once the area is numb, you will feel pressure and possibly a vibrating or buzzing sensation from the electrosurgical device, but the procedure itself should not hurt. The smell of singed tissue during the electrodesiccation phase catches some people off guard, but it is normal and harmless.
Afterward, the treated area is left as an open wound. It is typically covered with a simple petrolatum-based ointment and a bandage. Healing takes anywhere from two to six weeks depending on the size and location of the wound, with areas on the lower legs generally taking the longest. During healing, you keep the wound moist with ointment and change the bandage daily or as directed. There are no stitches to remove.
The final scar is usually round or oval, slightly depressed compared to the surrounding skin, and lighter in color. Larger treatment sites produce more noticeable scars. Some people develop a slightly raised or thickened scar, especially if they are prone to that type of healing. Compared with excisional surgery, which produces a linear scar, the ED&C scar is wider and more visible in some locations but less conspicuous in others. The trunk, for example, often heals well after ED&C, while the face tends to do better with a sutured closure.
Safety Considerations for Patients With Pacemakers
One of the most frequently asked safety questions is whether electrosurgery is safe for people with cardiac pacemakers or implantable defibrillators. The concern is that the electrical current could interfere with the device. The evidence here is reassuring. Studies have found that simple electrodesiccation of small lesions poses negligible risk to pacemaker patients.9PubMed. Electrosurgery and cardiac pacemakers A more recent study looking specifically at hyfrecation in patients with implantable cardiac devices found no adverse effects: no inappropriate defibrillator firing, no loss of pacing, no arrhythmias, and no device malfunction of any kind.10Dermatologic Surgery. Hyfrecation and Interference With Implantable Cardiac Devices
That said, most dermatologists still take precautions. The standard approach is to avoid using cutting current (which is higher power than desiccation current), keep the treatment site as far from the device as practical, use short bursts, and have monitoring available for patients with more complex cardiac histories. For the vast majority of small skin lesions treated in an office setting, the procedure can be performed safely.
How ED&C Compares With Cryotherapy for Benign Growths
For benign lesions like seborrheic keratoses, the main alternative to electrodesiccation is cryotherapy, which uses liquid nitrogen to freeze the growth off. Both techniques are quick and effective, and both are widely available in dermatology offices. The practical differences come down to a few factors.
Cryotherapy is somewhat faster since it requires no anesthesia for most benign lesions. You feel a brief stinging cold, and the treated area blisters and peels off over the following week or two. Electrodesiccation requires a local anesthetic injection, adds a few minutes, but tends to offer more precise control over exactly how much tissue is destroyed. For darker skin tones, both methods carry a risk of post-inflammatory pigment changes, though the risk profile differs slightly depending on the lesion and location. A study comparing the two techniques for trunk seborrheic keratoses found that both worked well, though patient preferences and cosmetic outcomes varied between the approaches.5PubMed Central. Patient Preferences and Comparative Outcomes Regarding Cryosurgery versus Electrodesiccation in the Removal of Truncal Seborrheic Keratoses In practice, many dermatologists choose between the two based on the individual lesion, the patient’s skin type, and personal preference.
Why ED&C Still Has a Place in a Mohs-Centric World
Mohs micrographic surgery, which examines 100% of the tissue margin during the procedure, offers the highest cure rates for skin cancer and is widely regarded as the gold standard, especially for high-risk tumors. Given that, you might wonder why anyone would choose ED&C. The answer comes down to proportionality. Many nonmelanoma skin cancers are small, superficial, and located on low-risk body sites. Using Mohs surgery for a tiny superficial BCC on someone’s back would be technically excellent but also far more time-consuming, expensive, and resource-intensive than the situation demands.
ED&C fills the niche of a fast, cost-effective, reliable treatment for the large volume of low-risk skin cancers that dermatologists see every day. The procedure takes minutes rather than the hour or more that Mohs often requires. It does not need a specialized histotechnician or a surgeon trained in Mohs technique. For patients with multiple skin cancers, which is common in older adults with a long history of sun exposure, the ability to treat several spots in a single short office visit is a practical advantage. The healthcare system simply could not funnel every nonmelanoma skin cancer through Mohs surgery without creating massive bottlenecks, nor would doing so improve outcomes for truly low-risk tumors.
The electrosurgery side of ED&C has also evolved beyond the simple desiccation current originally used. Modern electrosurgical units can deliver different waveforms for cutting, coagulation, and blended modes, giving dermatologists more versatility.11PubMed. Electrosurgery in dermatology But for ED&C specifically, the principle remains the same: high-frequency current generating heat to destroy tissue and control bleeding.1PubMed. Electrosurgery: part I. Basics and principles The simplicity of the technique is a feature, not a limitation, for the cases where it is appropriate.