Advancement Flaps for Skin Cancer Reconstruction: Restoring Appearance After Surgery

Why Reconstruction Is Needed After Skin Cancer Surgery

When a dermatologist removes a skin cancer — particularly with Mohs surgery — the resulting wound can range from a few millimeters to several centimeters wide. Small wounds on areas with loose skin can often be closed directly with stitches. But on the face, scalp, and other areas where skin is tighter or the wound is larger, simply pulling the edges together can cause distortion — pulling on eyelids, shifting the hairline, or creating an unnatural appearance.

Reconstruction techniques like advancement flaps solve this problem by borrowing skin from a nearby area that has more tissue to spare. The flap is designed to move skin from a region of relative laxity into the area of need, closing the wound with minimal tension and excellent cosmetic results.

What Is an Advancement Flap?

An advancement flap is a rectangle or other geometric shape of skin and underlying fat that is cut on two or three sides and slid directly forward (advanced) to fill a defect. Unlike rotation flaps (which pivot in an arc) or transposition flaps (which cross over a bridge of skin), advancement flaps move in a straight line — hence the name. The flap remains connected to its original blood supply through its base, which is the fourth side that is not cut. This preserved connection ensures the moved tissue receives nutrients and heals well.

The surgeon designs the flap dimensions carefully. The length-to-width ratio matters: if a flap is too narrow relative to its length, blood supply to the far end may be compromised. Typically, a 2:1 to 3:1 length-to-width ratio is safe on well-vascularized areas of the face.

Common Sites Where Advancement Flaps Are Used

Advancement flaps work particularly well in areas where skin moves naturally along a single axis and where incisions can be hidden in natural folds or hairlines:

• Forehead: Horizontal lines on the forehead allow H-plasty or unilateral advancement flaps that heal along natural expression lines
• Scalp: Bipedicle advancement flaps (cut on two sides, connected on two) can close significant scalp defects by advancing tissue from both sides
• Eyelids: Semicircular or tarsoconjunctival advancement flaps restore eyelid function and appearance
• Cheeks and temple: Redundant lateral cheek tissue can be advanced medially to close midface defects
• Lips: Perioral skin advances to maintain lip symmetry and function after cancer removal near the vermilion border

How the Surgery Is Performed

Advancement flap reconstruction is typically performed on the same day as Mohs surgery, after the surgeon confirms all cancer has been cleared. The entire process is done under local anesthesia in the office. General anesthesia is rarely needed.

The steps involved:

1. The surgeon designs the flap on paper (or digitally), mapping the defect size and planning incision lines to align with natural skin tension lines and facial features
2. Local anesthesia is injected around the defect and along the planned incision lines
3. Incisions are made to release the flap from three sides, leaving the base intact
4. The flap is elevated — lifted from the deeper tissue — allowing it to be moved without tearing
5. The flap is advanced forward into the wound and sutured in place with multiple layers of stitches: deep sutures close tension at the subcutaneous level, and surface sutures close the skin
6. The donor site (where the flap came from) is also closed, usually in a straight line

The procedure typically takes 30–90 minutes depending on the complexity and size of the defect.

Healing and What to Expect

After surgery, expect some swelling, bruising, and mild soreness for the first few days. Swelling peaks around days 2–3 and gradually resolves over 1–2 weeks. The final scar appearance continues to improve for 12–18 months as scar tissue matures and softens.

Key healing milestones:

• Days 1–3: Swelling and bruising peak; keep the area clean and apply petrolatum as directed
• Days 7–14: Sutures are removed (absorbable deep sutures dissolve on their own)
• Weeks 2–6: Surface redness fades; scar appears firm and slightly raised — this is normal
• Months 3–12: Scar softens, flattens, and blends with surrounding skin

Sun protection over the scar is important during the first year. UV exposure on a healing scar can cause permanent hyperpigmentation. Use SPF 30+ sunscreen or cover the area with clothing or a bandage when outdoors.

Outcomes and Risks

Advancement flaps have excellent outcomes in experienced hands. Because the moved skin is immediately adjacent to the defect, color and texture matching is usually very good. Risks include:

• Wound dehiscence (edges separating): uncommon if sutures are maintained and activity is limited
• Infection: rare with proper wound care; signs include increasing redness, warmth, and discharge after the first 48 hours
• Dog-ear deformity: small pucker of skin at the corners of the flap, which can be revised once healed
• Flap tip necrosis: death of tissue at the far end of the flap due to insufficient blood supply — uncommon when flap dimensions are appropriate
• Distortion of nearby structures: on the eyelid or lip, careful design minimizes pulling or asymmetry

When to See a Dermatologist

• You have been told you need reconstruction after Mohs surgery and want to understand your options
• Your wound is on the face and you are concerned about cosmetic results
• You notice signs of infection: increasing pain, redness, swelling, or pus after the first 48 hours
• You have bleeding that does not stop with 15 minutes of firm pressure
• You are unhappy with a prior scar and want to discuss revision options

Frequently Asked Questions

Will I be able to see the scar?

Some scarring is inevitable with any surgery, but skilled surgeons design advancement flaps so incisions align with natural skin lines and facial folds where scars blend in. Over 12–18 months, most patients are satisfied with their cosmetic result. In some cases, minor scar revision procedures (laser, dermabrasion, or excision) can be done after full healing to further refine the appearance.

Is an advancement flap better than a skin graft?

It depends on the location and size of the wound. Advancement flaps use skin from right next to the defect, so color and texture match very well. Skin grafts sometimes produce a patchwork appearance because donor skin comes from a distant site. However, grafts are sometimes necessary when there is not enough loose adjacent skin. Your surgeon will choose the best approach for your specific anatomy.

How long before I can return to normal activity?

Light activity can usually resume within a day or two. Avoid vigorous exercise, heavy lifting, and bending for 1–2 weeks. Activities that raise blood pressure or cause straining can promote bleeding and wound separation. Your surgeon will give you specific guidance based on the location and complexity of your repair.

Can this be done in the office, or do I need to go to a hospital?

Advancement flaps after Mohs surgery are nearly always performed in the dermatologist's office under local anesthesia. Hospital or operating room facilities are reserved for very large defects, complex multi-flap reconstructions, or patients who cannot tolerate in-office procedures.

Trusted Resources

• American Academy of Dermatology — aad.org
• American College of Mohs Surgery — mohscollege.org
• Skin Cancer Foundation — skincancer.org

Always consult a board-certified dermatologist or dermatologic surgeon for personalized advice about reconstruction options after skin cancer surgery.