Squamous cell carcinoma (SCC) most often appears as a firm, rough bump or a flat, scaly red patch on sun-exposed skin. It can also show up as an open sore that bleeds, crusts over, and never fully heals. The look varies depending on how early or advanced it is, where it is on the body, and your skin tone.
The Classic Appearance
The textbook SCC is a shallow ulcer with raised, heaped-up edges, often covered by a crusty plaque. Think of a sore that looks like it should heal but doesn’t. The surface may be scaly, crusty, or topped with a hard, horn-like projection of skin called a cutaneous horn. The surrounding skin is often pink or red, and the lesion itself feels rough or gritty to the touch.
Not all SCCs look that dramatic, though. Some appear as a pink, smooth nodule with no obvious surface changes at all. Others look more like a persistent dry, scaly patch that could easily be mistaken for eczema or psoriasis. The key warning sign across all variations: the spot doesn’t go away on its own, or it heals temporarily and then comes back.
Early Stage vs. Advanced Lesions
In its earliest form, SCC stays confined to the top layer of skin. This stage, called squamous cell carcinoma in situ (or Bowen disease), typically looks like a sharply outlined, flat, reddish patch. These patches tend to be scalier and redder than the small, rough spots of precancerous actinic keratosis, and they’re often larger. At this point the lesion is entirely treatable and hasn’t invaded deeper tissue.
As SCC progresses, it grows into a more defined nodule or lump. It may begin to ulcerate, forming a crater-like center that bleeds easily. The edges become more raised and irregular. Most cases are caught while the cancer is still confined to the upper layer of skin, because SCC is usually slow to spread. But a lesion that’s growing quickly, bleeding repeatedly, or becoming tender deserves prompt attention.
Where It Shows Up
About 40% of SCCs develop on the head and neck, followed by the upper extremities (25%) and the lower extremities (21%). For men specifically, over half of cases appear on the head and neck. Women show a different pattern: the lower legs are the most common site, accounting for roughly 41% of cases in women. This tracks with typical sun exposure patterns, since the legs are more frequently exposed in women’s clothing.
The lips are another common location, particularly the lower lip. SCC on the lip often starts as a pale, dry, cracked area that may burn in the sun. It can look like persistent chapped lips that won’t respond to balm.
How It Looks on Darker Skin
On Black and brown skin, SCC behaves differently in a crucial way: it’s more likely to appear on skin that isn’t sun-exposed, including the genitals, the soles of the feet, and the lower legs. The color also varies. Rather than the pink or red typical of lighter skin, SCC on darker skin may appear brown, black, or the same color as the surrounding skin. This makes it easier to overlook or misidentify.
A firm, skin-colored nodule in an area that doesn’t get much sun is worth having evaluated, especially if it’s new, growing, or won’t heal.
How to Tell SCC From Other Skin Cancers
Basal cell carcinoma, the other common non-melanoma skin cancer, has a distinctly different look. Basal cell tumors are often pearly or waxy, with visible blood vessels running through them and smooth, rolled borders. SCC, by contrast, is rougher, scalier, and more likely to crust or ulcerate. If a lesion looks like a rough, scaly sore rather than a shiny bump, SCC is the more likely concern.
Precancerous actinic keratoses are usually small (less than a quarter inch across), rough or scaly, and pink or flesh-colored. They can evolve into SCC over time. Signs that a precancerous spot may be transitioning include rapid growth, thickening, tenderness, or the development of new blood vessels visible at the surface.
Unusual Variants
Some forms of SCC look nothing like the classic description. Keratoacanthomas are dome-shaped growths with a crater in the center filled with a hard plug of keratin, resembling a tiny volcano. They can grow rapidly over weeks, which is alarming, though they sometimes shrink on their own. Because they can’t always be reliably distinguished from aggressive SCC, they’re typically removed.
Verrucous carcinoma is another variant that looks more like a large, stubborn wart than a typical cancer. It grows slowly and pushes outward rather than invading deeply. A wart-like growth that doesn’t respond to standard treatment and keeps expanding should raise suspicion.
What Size Matters
Any suspicious spot warrants evaluation, but size helps doctors assess risk once SCC is confirmed. Tumors on the head, face, neck, hands, feet, shins, or genitals are considered high-risk at any size. On the trunk, arms, or legs, tumors between about the size of a nickel (2 cm) and a quarter (4 cm) are high-risk. Anything over 4 cm anywhere on the body is very high-risk. A biopsy, where a small sample of tissue is removed and examined under a microscope, is the only way to confirm the diagnosis.
Signs You Shouldn’t Ignore
The visual features that should prompt you to get a spot checked include a rough bump or growth that crusts over like a scab and bleeds, a wound that won’t heal or keeps returning after it seems to heal, a scaly patch that’s growing or changing, and a lump that feels dry, itchy, or different from the skin around it. None of these guarantee cancer, but all of them fall into the category of “worth a look” from a dermatologist. SCC caught early is highly treatable, and the overwhelming majority of cases are diagnosed before they’ve had a chance to spread.