Basal Cell Carcinoma
Basal cell carcinoma is the most common cancer in people. It grows slowly and very rarely spreads to other organs, but it does not heal on its own, and left alone it keeps growing into the skin and tissue around it.
Key facts
Basal Cell Carcinoma at a glance.
Typical signs
Pearly growth or nonhealing sore
Common locations
Head, neck, trunk
Expected course
Slow growth; local damage possible
Treatment options
Surgery; alternatives for selected tumors
What is it?
Top things to know about Basal Cell Carcinoma
- It is a common skin cancer. It usually grows locally and can damage surrounding tissue.
- It looks different in different people. It may be a pearly bump, scaly patch or sore that bleeds and heals.
- It rarely spreads. Distant spread is rare, but it still needs treatment.
- Biopsy guides treatment. Location, size, subtype and history shape the treatment plan.
What it looks like
What Basal Cell Carcinoma looks like
Basal cell carcinoma is the most common skin cancer. It often looks like a pearly or shiny bump with tiny visible blood vessels, a sore that heals and comes back, or a scar-like patch. It grows slowly and rarely spreads, but it can damage nearby tissue if left untreated. It appears mostly on sun-exposed skin, especially the face, nose, ears, neck and scalp.
Basal cell carcinoma has several subtypes that look and behave differently.
Nodular basal cell carcinoma
Pearly bump; most common.
Superficial basal cell carcinoma
Flat, scaly pink patch, often on the trunk.
Pigmented basal cell carcinoma
Brown to black pearly bump.
Morpheaform basal cell carcinoma
Scar-like and harder to see.
Where it shows up
The head and neck are frequent sites, but basal cell carcinoma can develop elsewhere, including the trunk.
Face
Facial locations.
Neck
Locations around the neck and nape.
Chest
Locations on the front of the upper trunk.
Upper back
Locations on the upper back.
On different skin tones
Basal Cell Carcinoma on different skin tones
Basal cell carcinoma is most common in lighter skin. In medium and darker skin, it is less common, but it is more often pigmented, appearing brown or black, which can make it look like a mole or melanoma. A shiny or pearly surface is a helpful clue on every skin tone.
What happens in Basal Cell Carcinoma?
DNA changes disrupt normal growth signals in basal-type skin cells. Abnormal cell clusters can grow into nearby skin and produce a spot that bleeds, breaks down or fails to heal.
- The surface may break down: A spot can bleed or fail to heal.
- Cell-control signals change: DNA changes allow abnormal growth.
- Tumor nests grow into nearby skin: The cancer can extend below the surface.
Causes and triggers
What causes Basal Cell Carcinoma
Causes
Why it happens
Basal cell carcinoma starts when ultraviolet light damages basal cells in the lowest layer of the epidermis.
Fair skin, and rare conditions like Gorlin syndrome, raise the risk.
Risk factors
Raise the odds
- Fair skin
- Age over 50
- Past radiation treatment
- Weakened immunity
Triggers
Bring it on or make it worse
- Unprotected sun exposure (Well established)
- Tanning beds (Well established)
- Childhood sunburns (Strong link)
When it usually starts
When it usually starts
Basal Cell Carcinoma
Most common in adults with cumulative ultraviolet damage, though younger adults can develop it.
Daily care
Daily care for Basal Cell Carcinoma
Daily broad-spectrum sunscreen
With clothing, hats and shade, fewer future tumors.
No tanning beds
No version of this is safe.
Mohs surgery for high-risk tumors
Edges checked before closing.
Curettage and electrodessication
For small superficial tumors on trunk or limbs.
Prescription creams
Imiquimod and 5-fluorouracil, for thin superficial tumors only.
Radiation treatment
An option when surgery is not suitable.
Specialist drug treatment
For rare advanced tumors.
Treating the sun damage around the tumor
Rough scaly spots nearby are treated too.
Arrange early assessment for lesions on the nose, eyelids, ears or lips
The nose, eyelids, ears and lips are time-sensitive.
Follow the specialist plan for a high-risk tumor subtype
Infiltrative or morpheaform spreads further than it looks.
Discuss immune suppression and the need for closer monitoring
More tumors, closer monitoring.
Avoid: Reading the heal-and-return cycle as healing
It is the classic sign.
Avoid: Continuing sun exposure and tanning beds
More damage, more tumors.
Avoid: Picking or knocking the lesion
Keeps the surface broken and hard to assess.
Avoid: Ignoring numbness or tingling
The tumor may be tracking along a nerve.
Avoid: Waiting because it does not hurt
Pain is late, so waiting means a bigger repair.
Avoid: Treating it yourself
Wart removers and black salve blur the borders.
Avoid: Incomplete removal
Involved margins mean the tumor is still there.
Avoid: No skin checks after treatment
Follow-up finds the next one small.
Treatments
Treatments for Basal Cell Carcinoma
Mohs Surgery
The tumor is removed in stages and the edges are examined under a microscope during the same appointment, so complete removal is confirmed before the wound is closed. It has the highest cure rate and spares the most normal tissue, which is why it is used on the face and for aggressive subtypes. It takes several hours, and it is not needed for every tumor.
Excision
The tumor is cut out with a margin of normal skin around it and the wound is stitched, with the margins checked by a pathologist afterwards. It is the standard treatment for most tumors away from the face, and it cures the large majority in one visit. If the report comes back with the tumor at the edge, more treatment is needed.
Electrodesiccation and Curettage
The tumor is scraped away and the base burned, repeated a few times in one visit. It suits small, thin, superficial tumors on the trunk and limbs and is quick and cheap. Nothing is checked under a microscope afterwards, so it is not used on the face or for aggressive subtypes, and it leaves a permanent pale round mark.
Photodynamic Therapy
A light-sensitizing cream is left on the tumor and then activated with a lamp, usually in two sessions. It is for thin superficial tumors only, confirmed by biopsy, and it has the advantage of treating the sun-damaged skin around them at the same time. It stings during the light, and the cure rate is lower than surgery.
Cryotherapy
Freezing is quick and occasionally used for small superficial tumors when other options do not suit. Nothing is checked under a microscope, so an incompletely treated tumor can carry on growing under a healed surface. It also leaves a permanent pale patch, which is much more noticeable on deeper skin tones.
Skin Biopsy
A small sample taken under local anesthetic, usually a shave or a punch, and read by a pathologist. It does two things: it confirms this is a basal cell carcinoma, and it names the subtype. The subtype is what decides which treatment is right, so this comes before the treatment conversation rather than after it.
Outlook
What to expect with Basal Cell Carcinoma
Basal cell carcinoma is slow, which is why it gets lived with for too long. It grows in one place over months and years, and the heal-and-return cycle is what finally gets it noticed.
- 1
Starting · Months to years
A small pearly, pink, scaly or pigmented bump or patch appears and enlarges very gradually. No pain, no itch, so it gets dismissed.
- 2
The recurring sore · The classic pattern
It scabs, bleeds when knocked, shaved over or towel-dried, appears to heal, then breaks down in the same place. People read that cycle as improvement.
- 3
Untreated · Over years
On the nose, eyelid, ear and lip it can reach cartilage and deeper structures, and the repair needed becomes far larger. Ulceration, bleeding and a persistent open area are late features. Some subtypes track along nerves, causing numbness or tingling. Spread to lymph nodes or other organs happens, but is genuinely rare.
- 4
Removal · Two to six weeks to heal
Healing takes roughly two to six weeks; site and technique decide the scar.
- 5
After treatment · The next five years
A large proportion of people develop another within five years, usually elsewhere on sun-exposed skin. The original site can recur too, most often with an aggressive subtype or incomplete removal. Any new bump, scab or change in an old scar gets checked, not assumed to be scar tissue.
Complications
Complications to know about
The most useful clue there is
It scabs, bleeds when knocked, shaved over or towel-dried, appears to heal, then breaks down in the same place. People read that cycle as improvement.
It keeps invading nearby tissue
On the nose, eyelid, ear and lip it can reach cartilage and deeper structures, and the repair needed becomes far larger. Ulceration, bleeding and a persistent open area are late features. Some subtypes track along nerves, causing numbness or tingling. Spread to lymph nodes or other organs happens, but is genuinely rare.
When to get help
When to get help
When to seek care
Arrange assessment of a persistent pearly bump, ulcer or repeatedly bleeding sore. It usually grows locally and needs treatment rather than observation alone.
Lookalikes
What else could it be?
Seborrheic Keratosis
Seborrheic keratoses usually feel rough or waxy and look stuck on. Basal cell cancer is more often shiny and may repeatedly bleed or scab.
Eczema
Eczema often itches, comes and goes, and affects several places. A basal cell cancer patch may stay in one spot and keep returning despite treatment.
Melanoma
Melanoma may have an uneven outline and several colors. Basal cell cancer is often a shiny, raised bump, but appearance alone cannot reliably separate them.
Questions
Questions you might be asking.
Is basal cell carcinoma dangerous?
Rarely dangerous to your life, because it almost never spreads to other organs. It is a real risk to the tissue around it, it keeps growing, and it does not resolve, so the question is not whether to treat but how soon. Earlier means a smaller procedure.
How fast does it grow?
Slowly, over months to years, which is why it gets left. The slowness is why early treatment works so well: a tumor caught at a few millimeters on the nose is a short procedure, and the same tumor two years later can need reconstruction.
What is Mohs surgery and do I need it?
The tumor is removed in stages and the edges examined under a microscope at the same appointment, so complete removal is confirmed before closing. It spares the most normal tissue and is used mainly on the face and for higher-risk tumors. Ask why a method is recommended for yours.
Can I just use a cream instead of surgery?
Sometimes, for thin superficial tumors on the trunk or limbs, and only after a biopsy has shown that subtype. Cure rates are lower, treatment runs for weeks, and the skin gets red, sore and crusted while it works. A trade-off, not an easier option.
Will I get another one?
A large proportion do, usually within about five years and elsewhere on sun-damaged skin. Not a sign the first treatment failed - it is why skin checks and daily sun protection are part of the plan.
Will it leave a scar?
Yes. Every treatment leaves a mark, and how it looks depends on the site and the method. If you have ever had a thickened or keloid scar, say so beforehand; it can change the technique and closure. Silicone and sun protection help once it has healed.
Sources
Sources and further reading
Related
Keep exploring.
Electrodesiccation and Curettage
Melanoma
Mohs Surgery
Photodynamic Therapy
Surgical Excision
Seborrheic Keratosis
Cryotherapy
Eczema
Skin Biopsy
Basal Cell Carcinoma vs Seborrheic Keratosis
Basal Cell Carcinoma vs Acne
