Skin cancer shows up as a visible change on your skin, most often a new growth, a sore that won’t heal, or a mole that starts looking different. The specific symptoms depend on which type of skin cancer is developing, and the three most common types each have a distinct appearance. Recognizing these changes early matters enormously: localized melanoma, the most dangerous common form, has a 5-year survival rate of 100%, while melanoma that has spread to distant parts of the body drops to 34%.
Basal Cell Carcinoma: The Most Common Type
Basal cell carcinoma is the skin cancer people get most often, and it typically appears on sun-exposed areas like the face, ears, and neck. On lighter skin, it often looks like a slightly transparent or pearly bump that’s skin-colored or pink. You might notice tiny blood vessels visible through the surface. On brown and Black skin, the bump tends to look brown or glossy black with a rolled border, and those small blood vessels can be harder to spot.
Not all basal cell carcinomas look like bumps. Some appear as a flat, brown, black, or blue lesion with dark spots and a slightly raised, translucent border. Others resemble a white, waxy, scar-like patch without a clearly defined edge. One hallmark of basal cell carcinoma is a sore that bleeds, scabs over, and then reopens. If you have a spot that keeps cycling through healing and reopening, that pattern alone is worth getting checked.
Squamous Cell Carcinoma Symptoms
Squamous cell carcinoma tends to show up on areas that get regular sun exposure: the face, ears, hands, and arms. It can appear as a firm bump (called a nodule) that may be skin-colored, pink, red, brown, or black depending on your complexion. It can also look like a flat sore with a scaly crust, or a raised, wart-like growth.
One pattern that often gets overlooked is a rough, scaly patch on the lip that eventually becomes an open sore, or a sore or rough patch inside the mouth. Squamous cell carcinoma can also develop on old scars or chronic sores, showing up as a new raised area on damaged skin you might have stopped paying attention to years ago.
Precancerous Patches to Watch
Many squamous cell carcinomas start as actinic keratoses, which are rough, scaly spots caused by years of sun exposure. These patches feel like sandpaper and can be skin-colored, red, pink, brown, or gray. Some itch, sting, or feel tender. Others look like a scab or pimple that never fully resolves. Not all actinic keratoses become cancer, and most get treated before they progress, but they’re a clear signal that your skin has accumulated enough sun damage to warrant regular monitoring.
How to Spot Melanoma
Melanoma is less common than basal cell or squamous cell carcinoma but far more dangerous because it spreads faster. Dermatologists use the ABCDE rule to identify suspicious moles:
- Asymmetry: One half of the mole doesn’t match the other.
- Border: The edges are ragged, notched, or blurred, and pigment may spread into the surrounding skin.
- Color: Multiple shades are present, including black, brown, tan, white, gray, red, pink, or blue.
- Diameter: The spot is larger than 6 millimeters (about the size of a pencil eraser), though melanomas can start smaller.
- Evolving: The mole has changed in size, shape, or color over recent weeks or months.
A mole doesn’t need to meet all five criteria to be concerning. A lesion that fulfills even some of these features can warrant a biopsy. Change over time is the single most important signal. A mole that was stable for years and suddenly starts growing, darkening, or developing uneven color deserves prompt attention.
The Ugly Duckling Sign
Beyond the ABCDE criteria, there’s a simpler instinct-level check called the “ugly duckling” sign. Most moles on any one person tend to look similar to each other. If one mole stands out as clearly different from all the others, that outlier is worth examining. This approach was first described by dermatologists who noticed that melanoma often just looks “off” compared to a person’s normal mole pattern, and studies have found it’s a sensitive detection method.
Skin Cancer in Unexpected Places
Skin cancer doesn’t only show up on sun-exposed areas. One form, acral lentiginous melanoma, develops on the palms of the hands, soles of the feet, and under the nails. It occurs equally across all races and backgrounds and accounts for the majority of melanoma cases in people of color. The main sign is a black or brown discoloration on the palm or sole that may resemble a bruise or stain but grows in size over time.
Under the nails, this type of melanoma (called subungual melanoma) appears as a dark vertical streak running from the base to the tip of the nail. It can look like you drew a line on your nail with a brown or black marker. The line is usually less than 3 millimeters wide initially but may widen over time, particularly at the base of the nail. As it progresses, the nail can crack or break. This is sometimes mistaken for a fungal infection or a bruise from an injury, which can delay diagnosis.
Symptoms You Can Feel, Not Just See
Most people think of skin cancer as purely visual, but some lesions cause physical sensations. Itching around a skin growth and pain or tenderness in the area are both recognized symptoms. Spontaneous bleeding, where a spot bleeds without being scratched or bumped, is another warning sign. These sensory symptoms can sometimes show up before the visual changes become obvious, so persistent itching or tenderness in one specific spot on your skin is worth noting even if the area doesn’t look dramatically different yet.
Merkel Cell Carcinoma: Rare but Fast
Merkel cell carcinoma is uncommon, but it’s important to know about because it grows and spreads quickly. It typically appears as a firm, painless bump that grows rapidly over weeks. The bump can look pink, purple, red-brown, or match the surrounding skin color. Because it doesn’t always look alarming at first and can resemble a cyst or insect bite, the speed of its growth is the key distinguishing feature. Any new bump that noticeably increases in size over a short period should be evaluated promptly.
Who Faces Higher Risk
Certain factors increase the likelihood that a suspicious spot is actually cancerous. These include a personal or family history of melanoma, fair complexion, having many moles, a history of severe sunburns, and older age. If you have several of these risk factors, the threshold for getting a changing spot examined should be lower. People with darker skin tones are not immune to skin cancer. While melanoma is less common in people of color overall, it’s more likely to appear in less obvious locations like the palms, soles, and nail beds, and it’s more often diagnosed at a later stage because of the misconception that dark skin provides complete protection.