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Squamous Cell Carcinoma - Signs, Risks and Prevention

Squamous Cell Carcinoma (SCC) is one of the most common skin cancers—and when it’s found early, it’s highly curable.

Yet, if left untreated, SCC can grow deeper, damage nearby tissue, and in some cases spread to lymph nodes or distant organs. Carefully selected superficial lesions may be treated with minimally invasive options such as laser ablation or photodynamic therapy, while advanced cases may require immunotherapy like Libtayo (cemiplimab-rwlc). Knowing the signs, risks, and prevention strategies helps you act early and confidently.

What Is Squamous Cell Carcinoma?

SCC starts in keratinocytes, the squamous cells that form the skin’s outer layer. It most often develops on sun-exposed sites—face, ears, scalp, neck, lips, forearms, and hands—but it can appear anywhere, including the mouth and genitals. Learn more from the American Cancer Society.

While many SCCs are diagnosed and treated before they cause major problems, a subset can be aggressive. Estimates suggest cutaneous SCC affects well over a million Americans annually, with a small but meaningful risk of metastasis (often cited around 2–5% depending on tumor features and patient factors). See data summarized by the Skin Cancer Foundation for context.

Treatment depends on the tumor’s size, depth, location, and pathology. Common options include surgical excision or Mohs micrographic surgery; for select superficial SCC in situ (Bowen disease), clinicians may consider topical therapies (5‑FU, imiquimod), cryotherapy, photodynamic therapy, or laser ablation. For unresectable, locally advanced, or metastatic disease, PD‑1 inhibitors such as Libtayo (cemiplimab‑rwlc) or pembrolizumab may be recommended.

Early Signs and Symptoms

Spotting SCC early can expand your treatment choices and improve outcomes. If you notice any of the following changes that persist beyond a few weeks, get them checked by a dermatologist. See a visual guide to warning signs from the Skin Cancer Foundation:

  • Rough, scaly patches or plaques that may crust, itch, or bleed
  • Open sores that don’t heal, or that heal and then recur
  • Firm, red or skin-colored nodules
  • Flat lesions with a scaly or crusted surface
  • Thickened, wart-like growths
  • New or changing growths on sun-damaged skin
  • Tender or painful lesions, especially on the lips or inside the mouth

SCC can resemble eczema, psoriasis, or a persistent “pimple.” If something looks or feels off—and especially if it’s growing, bleeding, or not healing—book an evaluation. You can locate a specialist via the AAD’s Find a Dermatologist directory.

Who’s at Higher Risk?

Anyone can develop SCC, but certain factors increase risk. Understanding yours helps you fine-tune prevention and screening. Reliable overviews are available from the American Academy of Dermatology and CDC:

  • Chronic UV exposure from sunlight
  • Indoor tanning (classified as carcinogenic by the IARC/WHO)
  • Fair skin, light eyes, blonde or red hair
  • Age over 50 (but SCC can occur earlier, especially with high UV exposure)
  • History of skin cancer or precancers (e.g., actinic keratoses)
  • Weakened immunity (e.g., organ transplant, certain cancers, medications)
  • Exposure to carcinogens (e.g., arsenic), prior radiation to the skin, or chronic wounds/scars
  • High-risk HPV infection, particularly for anogenital and some oral SCCs
  • Tobacco use, especially for lip and oral SCC

Proven Prevention Strategies

Not every SCC is preventable, but consistent sun-safe habits and routine skin checks can dramatically reduce risk and catch problems early. The AAD’s guidance on sun protection is a great place to start.

  • Use broad-spectrum sunscreen daily: SPF 30 or higher, water-resistant. Apply 15 minutes before sun, use about one ounce (a shot glass) for full-body coverage, and reapply every two hours or after swimming/sweating. See how to choose.
  • Wear protective clothing: Long sleeves, pants, a wide-brimmed hat, and UV-blocking sunglasses. Consider UPF-rated clothing for extended outdoor time.
  • Seek shade mid-day: UV peaks from 10 a.m. to 4 p.m.; plan outdoor activities for mornings or late afternoons when you can.
  • Avoid tanning beds: There’s no safe indoor tan. If you want color, try sunless tanners.
  • Do monthly skin self-exams: Track new or changing spots with smartphone photos. If something changes, get it checked.
  • Mind vulnerable skin: Scars, burns, or chronic ulcers need extra protection and prompt attention if they change.
  • Ask about nicotinamide (vitamin B3): In high-risk adults, 500 mg twice daily reduced new nonmelanoma skin cancers in a randomized trial (NEJM 2015). Discuss suitability with your clinician.

Diagnosis: What to Expect

If your clinician suspects SCC, the next step is a skin biopsy—removing a small tissue sample to confirm the diagnosis and measure depth. Pathology details (e.g., tumor thickness, differentiation, perineural invasion) help determine risk and guide treatment. The American Cancer Society explains common tests and staging.

Treatment Options at a Glance

Therapy is individualized. Your care team will tailor options based on tumor features, your health, and cosmetic/functional goals.

  • Excision: The tumor and a margin of normal skin are removed; typically an outpatient procedure.
  • Mohs surgery: Tissue is examined layer by layer during surgery for maximal cure and tissue preservation—often used for cosmetically sensitive or high-risk areas.
  • Curettage and electrodesiccation: Scraping and cauterizing small, superficial tumors; best for carefully selected lesions.
  • Cryotherapy: Freezing small superficial lesions; commonly used for SCC in situ or precancers.
  • Topical therapies: 5‑fluorouracil or imiquimod for SCC in situ under dermatologic supervision.
  • Photodynamic therapy and laser ablation: Minimally invasive options for some superficial SCC in situ—ask whether laser treatment for skin cancer is appropriate in your case. See AAD guidance on treatments.
  • Radiation therapy: Useful when surgery isn’t feasible or as an adjunct for higher-risk disease.
  • Systemic therapy: For unresectable, locally advanced, or metastatic SCC, PD‑1 inhibitors such as Libtayo (cemiplimab‑rwlc) or pembrolizumab may be used. Learn about immunotherapy from the NCI.

Your dermatologist will also discuss follow-up schedules and sun-safety plans, since people who’ve had one SCC are at higher risk of developing another.

When to See a Specialist Now

Make an urgent appointment if you notice a fast-growing lump, a painful or bleeding lesion that won’t heal, a new growth on a scar or radiation site, or numbness/tingling near a lesion (a possible sign of nerve involvement). If you’ve been told your SCC is “high risk” or “advanced,” consider a second opinion at a center with NCCN-guided expertise.

Quick Self-Check Routine (Once a Month)

  • Examine your face, scalp (use a mirror or partner), ears, lips, neck, chest, and abdomen.
  • Check the back of your arms, forearms, hands, and under nails.
  • Look at your back, buttocks, legs, feet, soles, and between toes.
  • Note any spot that is new, changing, nonhealing, tender, or bleeding—and schedule an exam.

Bottom Line

Squamous Cell Carcinoma is common and often highly treatable when detected early. Learn the warning signs, know your risks, practice daily sun protection, and keep regular skin checks on your calendar. If a lesion concerns you, don’t wait—see a dermatologist. Early action can preserve healthy tissue, expand your treatment choices (including minimally invasive options for select superficial lesions), and protect your long-term health.