Mohs Surgery for Skin Cancer of the Lip

The lower lip is one of the most common sites for squamous cell carcinoma, driven by years of sun exposure to the dry vermillion. Lip skin cancer can also occur on the upper lip and the cutaneous portion of the lip, and basal cell carcinoma is occasionally seen in these locations.

The lip presents three reconstructive challenges that other facial sites do not: the vermillion border is a sharp aesthetic landmark that the eye notices immediately if it is misaligned, the lip must remain competent enough to contain saliva and food, and sensation of the lip matters for eating, speaking, and kissing. Mohs micrographic surgery is the preferred treatment for lip skin cancer because it preserves the maximum amount of normal lip tissue.

The lip is divided into the cutaneous lip (the skin above the vermillion), the dry vermillion (the visible pink portion), and the wet vermillion (the mucosal surface inside the mouth). The transition between dry vermillion and skin is the vermillion border, a precise aesthetic line that must be reapproximated within a millimeter during reconstruction.

The lip is supplied by the labial arteries, which run just beneath the vermillion border, and is innervated by the infraorbital nerve (upper lip) and the mental nerve (lower lip). Reconstruction must preserve sensation and oral competence as much as possible. Defects involving more than one third of the lip require more involved reconstruction to maintain function.

In Mohs micrographic surgery for lip skin cancer, the visible tumor and a thin margin of surrounding tissue are removed under local anesthesia. The tissue is then processed and examined by Dr. Lopez under a microscope while you wait. If any cancer cells remain at the margin, only that specific area is removed in the next stage, leaving healthy tissue intact. The process is repeated until the margins are clear.

Most lip Mohs cases are completed in one or two stages. Dr. Lopez averages 1.4 stages per Mohs case on head and neck sites. Mohs surgery achieves cure rates up to 99 percent for basal cell carcinoma and squamous cell carcinoma while removing far less normal lip tissue than a standard excision would require.

After the cancer is fully removed, the defect is reconstructed. Most lip defects can be closed with relatively straightforward techniques that preserve the vermillion border and oral competence. The reconstruction approach depends on defect size, location, and whether the defect involves the cutaneous lip, the vermillion, or both.

Common reconstruction techniques Dr. Lopez performs in house include:

• Primary closure with careful realignment of the vermillion border
• V-Y advancement flaps for cutaneous lip defects
• Mucosal advancement for defects involving only the dry vermillion
• Rotation or advancement flaps from adjacent perioral skin

Dr. Lopez performs 99 percent of his own reconstructions, choosing the simplest technique that will preserve the vermillion border, oral competence, and a good cosmetic result. Tumor removal and reconstruction are completed on the same day, in the same visit.

Dr. Lopez has personally performed over 10,000 Mohs micrographic surgery procedures since completing his Mayo Clinic fellowship in 2018, with 1,757 cases performed in 2025. The head and neck are his most common treatment sites. In 2025, 1,288 of his Mohs cases (73 percent) were performed on the head, neck, or other anatomically sensitive sites, of which the lip is a frequent location, particularly for squamous cell carcinoma of the lower lip.

Dr. Lopez accepts referrals for lip skin cancer cases from dermatologists, primary care physicians, plastic surgeons, oculoplastic surgeons, facial plastic surgeons, and radiation oncologists across Tampa Bay.

Most patients are scheduled for a same-day consultation, Mohs procedure, and reconstruction in a single visit. You arrive in the morning, the cancer is removed, tissue is examined while you wait, and reconstruction is completed once the margins are clear. You leave the office the same day with the cancer gone and the wound closed.