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Squamous Cell Carcinoma: Signs, Risks & Prevention

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

In this guide, you’ll learn the top signs and symptoms, common risk factors, how to identify suspicious spots, what SCC can look like (including scab- or eczema-like patches), and proven prevention tips.

5 common signs and symptoms

Because SCC grows from keratinocytes near the skin’s surface, it often appears on sun-exposed areas like the face, ears, scalp, neck, forearms, and backs of the hands. It can resemble everyday skin issues, which is why knowing the hallmarks matters (American Academy of Dermatology).

Pay attention to any spot that persists beyond 3–4 weeks, becomes scaly or crusted, or bleeds without healing—especially if it’s new or noticeably changing (NHS). If a lesion is painful, tender to the touch, or growing, book a professional exam.

Here are five common SCC warning signs to check during monthly self-exams:

  • A firm, scaly red patch or plaque that doesn’t resolve, sometimes with a rough or sandpapery feel.
  • A non-healing sore that bleeds, oozes, or crusts, then seems to improve, only to recur in the same spot.
  • A wart-like growth that enlarges over weeks to months or becomes tender.
  • A raised growth with a central depression (sometimes described as a crater), which may form a thick crust.
  • A horn-like or thickened bump (a “cutaneous horn”) made of compacted keratin, particularly on sun-damaged skin.

Common risk factors

SCC risk rises with cumulative ultraviolet (UV) exposure and certain health or environmental factors. If you have any of the following, be especially proactive with prevention and screening (Skin Cancer Foundation; American Cancer Society):

  • Chronic sun exposure (work or recreation outdoors) and indoor tanning (CDC: Sun safety).
  • Fair or freckle-prone skin, light eyes or hair, or a history of sunburns.
  • Age (risk increases over time) and male sex.
  • Immunosuppression (organ transplant, certain medications, HIV) (Skin Cancer Foundation: Transplant recipients).
  • History of skin cancer or multiple actinic keratoses (pre-cancers).
  • Chronic wounds, scars, or inflammation (Marjolin ulcer).
  • Prior radiation to the skin or arsenic exposure.
  • HPV infection (certain types), especially for SCCs on the lips, genitals, or in the mouth/throat.

What does SCC look like—eczema or a scab?

SCC can masquerade as common skin problems. It might look like a scab that never fully heals or repeatedly crusts and bleeds. It can also appear as a red, rough patch that resembles eczema or psoriasis but doesn’t respond to moisturizers or topical steroids (Mayo Clinic).

Helpful clues: eczema usually affects larger, symmetric areas, tends to be very itchy, and improves with gentle skin care. SCC is more often a localized, firm spot with crusting or scaling that persists in one place and may be tender or bleed. When in doubt, have a clinician examine it—only a biopsy can confirm the diagnosis (AAD: Diagnosis).

How to spot it early: a quick skin self-check

Most SCCs are visible to the naked eye, so regular self-exams can catch trouble early. Use good lighting, a full-length mirror, and a hand mirror to view hard-to-see areas. Follow a consistent routine from scalp to soles (AAD: Skin self-exam).

  • Check sun-prone areas carefully: scalp (part lines), face, ears, neck, shoulders, forearms, backs of hands, and lower legs.
  • Don’t skip hidden sites: lips (especially lower lip), behind the ears, under the breasts, groin, and between toes.
  • Look for “new, changing, or non-healing” rather than only “ugly” spots—SCCs can be subtle.
  • Track persistence: if a scaly patch or sore lasts longer than 3–4 weeks, or returns in the same spot, schedule an exam.
  • Document changes: take clear photos with a size reference (coin or ruler) and note dates.

Prevention tips that really work

Preventing UV damage lowers SCC risk at every age. Combine sun-smart habits with routine checks and, if you’re high risk, talk to your clinician about additional strategies (WHO: UV radiation; CDC).

  • Use broad-spectrum SPF 30+ daily on exposed skin; reapply every 2 hours outdoors and after swimming or sweating (Skin Cancer Foundation: Sunscreen).
  • Wear protection: UPF clothing, a wide-brimmed hat, and UV-blocking sunglasses.
  • Seek shade and avoid peak sun (10 a.m.–4 p.m.).
  • Avoid tanning beds entirely—they emit high-intensity UVA/UVB.
  • Protect your lips with SPF lip balm; lower-lip SCCs are more prone to spread.
  • Manage precancers (actinic keratoses) promptly as advised by your dermatologist.
  • For very high-risk adults (e.g., multiple prior skin cancers), discuss nicotinamide (vitamin B3) 500 mg twice daily, which reduced new nonmelanoma skin cancers in a randomized trial (NEJM, 2015). Do not start supplements without medical advice.

Why early detection is crucial

When identified early, SCC is typically curable with outpatient procedures such as excision, curettage and electrodesiccation, or Mohs surgery, which maximizes tissue preservation and cure rates. Delayed diagnosis can allow the tumor to invade deeper tissues or spread to lymph nodes, especially for tumors on the lip, ear, scalp, or in immunosuppressed patients (NCI: Skin cancer treatment (PDQ)).

The bottom line: if a spot won’t heal, keeps crusting or bleeding, or steadily grows, get it checked. Early treatment usually means smaller procedures, less scarring, lower costs, and the best long-term outlook. If you’re at higher risk, schedule routine full-skin exams with a board-certified dermatologist and keep up with regular self-checks.