Mohs Surgery for Skin Cancer of the Scalp

Scalp skin cancer is common, particularly in patients with thinning hair or a history of extensive sun exposure. Cancers on the scalp often present later than cancers on the face because they can be concealed by hair, which means that scalp tumors are sometimes larger at the time of diagnosis.

Two factors make scalp surgery distinctive: the scalp is thick and inelastic compared to other facial skin, which limits how much tissue can be advanced or closed primarily, and the calvarium (skull bone) lies just beneath, which becomes relevant for deeper defects. Mohs micrographic surgery is the preferred treatment because it removes the cancer with margin control while preserving as much normal scalp tissue as possible.

The scalp has five layers (skin, subcutaneous tissue, galea aponeurotica, loose areolar tissue, and pericranium) and an unusually rich blood supply. The rich blood supply is favorable for reconstruction because rotation flaps reliably survive even when raised over large areas. The thickness and inelasticity of the scalp, however, limits how much defects can be closed by simple advancement.

Defects on hair-bearing scalp ideally are closed in a way that preserves surrounding hair so that the final result blends into the hair pattern. Defects on the bald scalp or close to the hairline require attention to cosmetic outcome since the result will be visible. Defects that involve or expose the pericranium or calvarium require different reconstruction techniques than superficial defects.

In Mohs micrographic surgery for scalp 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 scalp Mohs cases are completed in one or two stages. Dr. Lopez averages 1.4 stages per Mohs case on head and neck sites. The tissue-sparing nature of Mohs is particularly valuable on the scalp because every additional millimeter of removed tissue makes reconstruction more difficult. Mohs achieves cure rates up to 99 percent for basal cell carcinoma and squamous cell carcinoma.

After the cancer is fully removed, the defect is reconstructed. Most scalp defects can be closed with relatively straightforward techniques. The reconstruction approach depends on defect size, location, depth, and whether the surrounding scalp is hair-bearing.

Common reconstruction techniques Dr. Lopez performs in house include:

• Primary closure for smaller defects when surrounding tissue can be mobilized without distortion
• Local rotation flaps from adjacent scalp, which take advantage of the scalp's excellent blood supply and can be designed to preserve hair direction
• Healing by secondary intention, which is well tolerated on the scalp and often gives a good cosmetic result, particularly in bald or hair-thinned areas
• Full-thickness skin grafts for cosmetically less visible areas when local flap options are limited

Dr. Lopez performs 99 percent of his own reconstructions, choosing the simplest technique that will give a good cosmetic and functional 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 scalp is a frequent location.

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

Patients with significant sun damage on the scalp often have concurrent tumors on the ear, another heavily sun-exposed site Dr. Lopez treats routinely.

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.

Most scalp Mohs procedures are completed in a single visit. Cases healing by secondary intention may involve follow-up visits over the subsequent weeks.