basal cell carcinoma

What Is It?
Basal cell carcinoma (BCC) is the most common type of skin cancer. It arises from the basal cells, which are located in the lower part of the epidermis (the outer layer of the skin). BCC typically grows slowly and rarely spreads (metastasizes), but it can cause local tissue damage if left untreated.

Why It Matters
Although BCC is usually not life-threatening, early detection and treatment are crucial to prevent disfigurement, invasion of deeper tissues, and recurrence. Over 3.6 million cases are diagnosed annually in the U.S. alone. Most cases are related to cumulative sun exposure or tanning bed use, making prevention strategies important.

Key Facts (At a Glance)

  • Most common cancer in the U.S.

  • Risk factors: fair skin, chronic sun exposure, age >50, prior skin cancers

  • Usual locations: face, ears, neck, scalp—areas exposed to the sun

  • Slow-growing and highly treatable when caught early

  • Rarely metastasizes, but can cause local destruction if ignored

How It Affects the Body
BCC develops when DNA damage (usually from UV radiation) causes basal cells to grow uncontrollably. These tumors invade nearby tissues, including muscle and bone, if left untreated over time. While it almost never spreads to other parts of the body, recurrent BCCs are common in people with multiple risk factors.

Common Symptoms
BCCs can take several forms. Classic signs include:

  • Pearly or waxy bump (often with visible blood vessels)

  • Flat, flesh-colored or brown scar-like lesion

  • Bleeding or oozing sore that won’t heal

  • Crusted lesion that keeps returning

  • Translucent nodule that may appear pink, red, or white

  • Rolling edges around the lesion

Risks & Side Effects

  • Tissue damage if BCC invades deeper layers (fat, muscle, or bone)

  • Disfigurement, especially on the face or neck

  • Recurrence after treatment (especially if not fully removed)

  • Increased risk of developing other skin cancers, including squamous cell carcinoma and melanoma

Who Should Be Cautious

  • People with fair skin, light hair, and light eyes

  • Individuals with a history of excessive sun exposure or frequent sunburns

  • Tanning bed users

  • Immunocompromised individuals (e.g., organ transplant recipients)

  • People with genetic conditions like basal cell nevus syndrome (Gorlin syndrome)

  • Those with a history of radiation therapy

When to See a Doctor
Make an appointment with a dermatologist if you notice:

  • New or changing skin lesions

  • Non-healing sores or areas that bleed easily

  • Lesions with irregular borders, color changes, or size increase
    Diagnosis is typically made through a skin biopsy. Treatment options depend on the size, depth, and location of the cancer and may include surgical excision, Mohs surgery, cryotherapy, topical medications, or radiation.

Related Conditions / Interactions

  • Other skin cancers: People with one BCC are at higher risk of developing melanoma or squamous cell carcinoma

  • May occur alongside actinic keratosis (a precancerous condition)

  • Chronic BCC may contribute to facial disfigurement or functional damage (e.g., eyelid or nasal BCC)

Last Updated: June 15, 2025