Skin cancer on the leg can look like a changing mole, a scaly patch that won’t heal, a pearly bump, or a flat sore with a crust. The exact appearance depends on the type of skin cancer, and the three most common types each have distinct visual features. Because legs get significant sun exposure (especially the lower legs in people who wear shorts or skirts), they’re a common site for all three major skin cancers: melanoma, squamous cell carcinoma, and basal cell carcinoma.
Melanoma on the Leg
Melanoma is the most dangerous form of skin cancer, but it’s also the one with the most recognizable warning signs. On the leg, it typically appears as a new or changing mole that looks different from the other spots on your skin. The spot may have multiple colors, including shades of brown, black, tan, or unexpected tones like white, red, pink, blue, or gray. One half of the spot often doesn’t match the other half, and the borders tend to be jagged, notched, or blurred rather than smooth and round.
The ABCDE rule, developed by the National Cancer Institute, is the standard way to evaluate a suspicious spot:
- Asymmetry: one half doesn’t mirror the other
- Border: edges are ragged or blurred, and pigment may spread into surrounding skin
- Color: multiple shades or colors within a single spot
- Diameter: larger than about 6 millimeters (the size of a pencil eraser), though melanomas can start smaller
- Evolving: the spot has changed in size, shape, or color over weeks or months
Not every melanoma checks all five boxes. Some start as small, flat, brownish patches that only meet one or two criteria before they’re caught. The key signal is change. A mole you’ve had for years that suddenly starts growing, darkening, or developing uneven color deserves a closer look. When melanoma on the leg is caught while still localized (meaning it hasn’t spread beyond the skin), the five-year survival rate is 97.6%.
Squamous Cell Carcinoma on the Leg
Squamous cell carcinoma (SCC) is the second most common skin cancer and frequently shows up on sun-exposed parts of the legs, particularly the shins. It looks quite different from melanoma. The most typical presentation is a flat, reddish or brownish patch with a rough, scaly, or crusted surface. It can feel like a patch of sandpaper that doesn’t improve with moisturizer.
SCC can also appear as a firm bump or nodule. The color varies with skin tone: it may look pink or red on lighter skin and brown or black on darker skin. Some squamous cell cancers develop into dome-shaped growths with a crater-like depression in the center, resembling a small volcano. Others look like wart-like raised areas or new sores that form on top of old scars.
A hallmark of SCC is that it doesn’t heal. If you have a sore or scab on your leg that hasn’t resolved in about two months, that persistence itself is a warning sign. The area might itch, feel tender, or bleed intermittently.
Basal Cell Carcinoma on the Leg
Basal cell carcinoma (BCC) is the most common skin cancer overall, though it appears on the legs less often than on the face and neck. When it does develop on the leg, it typically looks like a firm, pearly or translucent bump. On closer inspection, you may notice tiny blood vessels running through or around the bump, giving it a slightly spidery appearance.
Some basal cell carcinomas appear as flat, pale or pink patches rather than raised bumps. Larger ones may develop oozing or crusted areas. Many have a small depression or dip in the center. These cancers are fragile and tend to bleed easily, sometimes after something as minor as toweling off after a shower. The colors range from flesh-toned to pink, red, or occasionally brown. BCC grows slowly and rarely spreads to other parts of the body, but it can cause significant local damage if left untreated.
Symptoms Beyond Appearance
Skin cancer on the leg isn’t always painless. Spots that itch persistently, feel tender to the touch, or bleed without a clear cause are worth examining. Sores that look crusty, develop a depression in the middle, or bleed repeatedly are particularly suspicious. A rough, scaly lesion that cycles between crusting, bleeding, and crusting again is a classic pattern for both squamous cell and basal cell carcinomas.
Any spot that changes over time deserves attention, even if it doesn’t hurt. Many skin cancers are completely painless in their early stages. The visual change is often the only clue.
Spots That Look Like Cancer but Aren’t
Legs are home to many harmless spots that can cause worry. Dermatofibromas are firm, small, brownish bumps common on the lower legs, especially in women. They often appear after a minor injury like a bug bite and feel like a hard pea under the skin. Age spots (also called liver spots) are flat, uniformly brown patches that don’t change over time. Bruises from bumping into furniture can sometimes linger for weeks, particularly on the shins where blood flow is slower.
The distinguishing features of skin cancer are irregularity and change. Benign spots tend to be uniform in color, symmetrical, and stable over time. A spot with multiple colors, uneven borders, or one that is visibly different from all your other moles (sometimes called the “ugly duckling” sign) stands apart from these harmless marks.
Hidden Spots on Feet and Toes
Skin cancer can also develop in places on the lower limbs that are easy to miss. Acral lentiginous melanoma is a rare type that appears on the soles of the feet, between the toes, or under toenails. On the sole, it looks like an unevenly pigmented black or brown spot that looks different from the surrounding skin and grows over time. Under a toenail, it appears as a dark streak or pigmented band running from the cuticle to the tip of the nail.
These spots are frequently mistaken for bruises, blood blisters, or warts. Doctors at MD Anderson Cancer Center note that patients commonly delay seeking care because they assumed the spot was harmless. The memory tool “CUBED” helps identify concerning nail or sole lesions: unusual Color, Uncertain diagnosis, Bleeding, Enlargement, and Delay in healing. If a dark mark on your sole or under your toenail doesn’t grow out or resolve within a few weeks, it’s worth having evaluated.
What a Professional Exam Involves
When you bring a suspicious leg spot to a dermatologist, they’ll likely examine it with a dermatoscope, a handheld device with a magnifying lens and a special light. This tool reveals structures beneath the skin’s surface that aren’t visible to the naked eye, including pigment patterns, blood vessel arrangements, and features at the junction between the outer and deeper layers of skin. These subsurface details help distinguish cancerous spots from benign ones with much greater accuracy than a visual check alone.
If the spot looks concerning under the dermatoscope, the next step is a biopsy, where a small sample of skin is removed and examined under a microscope. This is the only way to confirm whether a spot is skin cancer and, if so, what type it is. The procedure on the leg is quick and done with local numbing, and most people resume normal activity the same day.