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Early Signs and Treatment of Squamous Cell Carcinoma

Squamous cell carcinoma (SCC) is a common form of skin cancer that is highly treatable when found early.

In this guide, you’ll learn how to recognize the signs and symptoms, understand risk factors, and explore proven treatments—from in-office procedures to advanced immunotherapy—plus practical steps to protect your skin.

What Is Squamous Cell Carcinoma (SCC)?

SCC starts in the squamous cells—the flat cells that form the outer layer of your skin (epidermis). It most often appears on sun-exposed areas like the face, ears, lips, scalp, neck, and hands, but can develop anywhere, including sites of chronic wounds or inflammation. While this article focuses on cutaneous (skin) SCC, similar cancers can arise on mucous membranes. For a quick overview, see the American Cancer Society’s primer on basal and squamous cell skin cancers (ACS).

SCC is the second most common skin cancer and is diagnosed in well over a million people in the U.S. each year, according to the Skin Cancer Foundation. The good news: when detected early, SCC is very curable, with excellent outcomes after prompt treatment.

Signs and Symptoms of Squamous Cell Carcinoma

Common warning signs you can spot

  • A persistent, scaly red patch that may crust or itch
  • A firm, red or skin-colored bump (nodule) that may feel tender
  • A sore that doesn’t heal—or heals and then reopens
  • A rough, thickened, wart-like growth
  • A horn-like growth (cutaneous horn)
  • A flat area with a scaly surface and a raised border

These lesions often appear on sun-exposed skin (face, scalp, ears, neck, forearms, hands, and lower legs). SCC can also occur on the lip (especially lower lip), inside scars or chronic ulcers, and in immunosuppressed individuals (for example, after organ transplantation). The American Academy of Dermatology provides a helpful visual guide to signs and symptoms (AAD).

Red-flag features that need prompt evaluation

  • Rapidly growing or tender lesions
  • Bleeding with minor trauma or spontaneous bleeding
  • Lesions on high-risk sites: ear, lip, genital skin, or within scars
  • Numbness, tingling, or pain suggesting nerve involvement
  • Large size (for example, over 2 cm), deeply indurated, or fixed to deeper tissue
  • New lumps in nearby lymph nodes

If you notice any of the above, schedule a dermatology visit as soon as possible. High-risk features guide the choice of treatment and follow-up, as outlined in the NCCN Guidelines for Patients.

Causes and Risk Factors

The leading cause of cutaneous SCC is cumulative ultraviolet (UV) exposure from the sun or tanning beds. Fair skin, light hair/eye color, a tendency to sunburn, and living at high latitude or altitude increase risk. Indoor tanning is unsafe and raises the risk of both SCC and other skin cancers; see the CDC’s sun-safety guidance (CDC).

Additional risk factors include older age, male sex, a suppressed immune system (HIV, chronic leukemia, or post-transplant medications), prior radiation therapy, chronic wounds or scars, exposure to arsenic or industrial chemicals, and certain human papillomavirus (HPV) infections (particularly for genital or periungual SCC). ACS summarizes these risks and who is more likely to develop SCC (ACS risk factors).

How SCC Is Diagnosed

A dermatologist examines the skin and may use a dermatoscope (a handheld magnifier) to assess patterns. The definitive step is a skin biopsy—removing a small sample to examine under a microscope. Common biopsy methods include shave, punch, or excisional biopsy; the choice depends on lesion size, depth, and location. Pathology determines whether the cancer is in situ (confined to the top layer) or invasive, and notes high-risk features like perineural invasion (cancer cells along a nerve) or poor differentiation.

For higher-risk tumors, your clinician may evaluate lymph nodes and occasionally order imaging. Staging and risk stratification help tailor treatment and follow-up, as described in the NCCN patient guidelines and the AAD’s public resources (AAD).

Treatment Options for Squamous Cell Carcinoma

Localized SCC (most cases)

  • Excisional surgery: The tumor and a margin of normal skin are removed and sent to a lab to confirm clear margins. This is a standard, effective option for many low- to intermediate-risk SCCs (see ACS: Surgery).
  • Mohs micrographic surgery: Layer-by-layer removal with on-the-spot microscopic analysis. Mohs maximizes cure rates while sparing healthy tissue—ideal for high-risk tumors and cosmetically sensitive areas (face, ears, lips, digits). The Skin Cancer Foundation notes Mohs offers the highest cure rates for SCC treated for the first time.
  • Curettage and electrodesiccation (C&E): Scraping the lesion and cauterizing the base; best for small, well-defined, low-risk tumors on the trunk or limbs. Your dermatologist will advise if C&E is appropriate based on location and histology (ACS).

In situ or superficial disease

  • Cryotherapy: Freezing with liquid nitrogen for small, superficial lesions.
  • Topical therapies: 5-fluorouracil (5-FU) or imiquimod creams can treat SCC in situ (Bowen disease) or field cancerization under close supervision.
  • Photodynamic therapy (PDT): A light-activated treatment useful for select superficial lesions and precancers (actinic keratoses). Guidance on these options appears in AAD’s treatment overview.

When radiation or systemic therapy is recommended

  • Radiation therapy: An option for patients who cannot undergo surgery, or as adjuvant treatment when margins are close/positive or when there’s perineural invasion. ACS reviews indications and considerations (ACS: Radiation).
  • Immunotherapy: For locally advanced or metastatic cutaneous SCC, PD‑1 inhibitors like cemiplimab and pembrolizumab can shrink tumors and improve outcomes. Learn more at the ACS page on immunotherapy for BCC/SCC (ACS: Immunotherapy).
  • Targeted or chemotherapy: In select cases, epidermal growth factor receptor (EGFR) inhibitors (e.g., cetuximab) or chemotherapy may be used, often in combination with radiation or when immunotherapy isn’t suitable, as outlined by NCCN.

What to expect: Most localized SCCs are cured with one procedure. Your team will discuss margin status, the need for any adjuvant therapy, potential side effects (scarring, pigment change, numbness), and a tailored follow-up plan.

Prognosis, Follow-up, and Prevention

Outlook: When found early, SCC has an excellent prognosis. A small percentage—often cited as a few percent—can spread to lymph nodes or distant sites, especially when high-risk features are present or in immunosuppressed patients. The Skin Cancer Foundation and ACS both emphasize that timely diagnosis and appropriate treatment are key to preventing spread (SCF; ACS: Follow-up).

Follow-up: After treatment, schedule regular skin exams—often every 3–12 months depending on your risk—and perform monthly self-checks. Tell your clinician promptly about any new or changing lesions, persistent scabs, or enlarged lymph nodes. People who’ve had one SCC are at higher risk for additional skin cancers, so ongoing surveillance matters (AAD, ACS).

Prevention you can start today:

  • Seek shade and avoid midday sun (10 a.m.–4 p.m.).
  • Use a broad-spectrum, water-resistant sunscreen with SPF 30 or higher; reapply every two hours and after swimming or sweating.
  • Wear protective clothing, a wide-brimmed hat, and UV-blocking sunglasses.
  • Skip indoor tanning entirely.
  • Know your skin: do a head-to-toe self-exam monthly and photograph spots to track changes.
  • Treat precancers (actinic keratoses) as advised by your dermatologist.

For step-by-step sun safety and self-exam tips, explore resources from the CDC, the AAD, and the Skin Cancer Foundation.

When to See a Dermatologist

Make an appointment if you notice a growing, scaly, or non-healing spot that persists beyond two to four weeks, a sore that bleeds easily, a firm nodule, or a lesion on the lip or ear. Early evaluation can be the difference between a quick in-office cure and a more complex treatment plan. If you’re at higher risk (transplant recipient, prior radiation, extensive sun damage), ask about a personalized surveillance schedule and preventive therapies.

Key takeaways

  • Most SCCs are curable when treated early.
  • Know the warning signs and get suspicious spots checked promptly.
  • Choice of treatment—excision, Mohs, C&E, topical, radiation, or immunotherapy—depends on risk and location.
  • Sun protection and regular skin checks reduce your risk and catch problems sooner.