Skin cancer is the most common cancer in the United States, affecting millions of Americans each year. The three most frequently diagnosed types of skin cancer are basal cell carcinoma (BCC), squamous cell carcinoma (SCC), and melanoma. BCC and SCC are grouped together as non-melanoma skin cancer, while melanoma is treated as its own category because of how differently it behaves.
Each type of skin cancer has a distinct appearance, growth pattern, and level of seriousness. What they share is the fact that early detection makes treatment far simpler and outcomes far better.
The board-certified dermatologists at Suncoast Skin Solutions diagnose and treat every form of skin cancer at more than 30 locations across Florida, where year-round sun exposure makes routine skin checks especially important. The sections below cover the warning signs, causes, risk factors, and treatment options for each type of skin cancer, so patients know what to look for and when to seek care.
What Does Skin Cancer Look Like?
Skin cancer rarely announces itself loudly. Many lesions look like a harmless mole, pimple, or scratch at first, which is why subtle changes are worth paying attention to. The most common skin cancer symptoms and warning signs include:
- A new mole or growth that appears on the skin and continues to change over time
- A sore that does not heal, or one that heals and then returns
- A rough, scaly, or crusted patch that feels different from the surrounding skin
- A shiny, pearly, or waxy bump, sometimes with small visible blood vessels
- A flat red spot that is dry, rough, or scaly
- A mole that changes in size, shape, color, or texture
These signs of skin cancer can appear anywhere on the body, but some locations are more common than others. Skin cancer on the face is especially frequent because the face receives consistent UV exposure throughout life. The ears, nose, scalp, neck, lips, hands, and arms are also frequent sites. Any new spot or persistent change should be evaluated by a dermatologist.
The ABCDE Rule for Skin Cancer Detection
The ABCDE skin cancer detection method offers a quick way to evaluate a mole or spot at home and decide whether it needs professional review:
- Asymmetry: One half of the spot does not match the other.
- Border: Edges are uneven, ragged, notched, or blurred.
- Color: Not uniform, with shades of brown, black, pink, red, white, or blue within the same lesion.
- Diameter: Larger than about 6 millimeters (the size of a pencil eraser), though some skin cancers are smaller at the time of detection.
- Evolving: The spot is changing in size, shape, color, or surface texture, or has begun to itch, bleed, or crust.
A spot that meets one or more of these criteria warrants prompt evaluation. The ABCDE rule is most useful for identifying possible melanoma, but the same principle of watching for change applies to all skin cancer types.
Basal Cell Carcinoma (BCC)
Basal cell carcinoma is the most common skin cancer and the most common cancer of any kind diagnosed in the United States. It begins in the basal cells at the bottom of the epidermis, the outer layer of the skin, and most often develops on areas that receive regular sun exposure, such as the face, ears, neck, and shoulders.
BCC typically appears as one of the following:
- A pearly or waxy bump
- A flat, flesh-colored, or scar-like patch
- A sore that bleeds and scabs but never fully heals
On darker skin tones, lesions may look brown, blue, or black rather than pearly. BCC almost never spreads to other parts of the body, but if left untreated, it can grow deeper and damage surrounding tissue, cartilage, or bone, leading to disfigurement that complicates removal and reconstruction.
Most cases are highly treatable when caught early. Mohs surgery is often recommended for tumors on the face and other cosmetically or functionally sensitive areas because it offers the highest cure rate while preserving healthy tissue.
Learn more about basal cell carcinoma symptoms, types, and treatment options.
Squamous Cell Carcinoma (SCC)
Squamous cell carcinoma is the second most common type of skin cancer. It develops in the squamous cells of the upper layers of the epidermis and most often appears on sun-exposed skin, including the face, ears, lips, scalp, neck, backs of the hands, and arms.
SCC tends to look more inflamed than basal cell carcinoma. Common presentations include a firm red nodule, a flat lesion with a scaly or crusted surface, a wart-like growth, or an open sore that bleeds and refuses to heal. Lesions can be tender or itchy.
Patients often ask about basal cell carcinoma vs. squamous cell carcinoma. Both are non-melanoma skin cancers driven primarily by UV exposure, and both are highly treatable when caught early. The key differences come down to behavior: BCC grows slowly and almost never spreads, while SCC grows faster and carries a small but real risk of spreading to nearby lymph nodes or deeper tissue if it is not treated promptly. When detected early, SCC responds well to surgical excision or Mohs surgery, with excellent outcomes.
Learn more about squamous cell carcinoma symptoms, stages, and treatment options.
Melanoma
Melanoma is the most serious and potentially deadly type of skin cancer. It develops in melanocytes, the pigment-producing cells responsible for skin and hair color, and is far more likely than BCC or SCC to spread to the lymph nodes, organs, and other parts of the body if not caught early.
Melanoma often appears as a new dark spot on the skin or as an existing mole that begins to change. It can develop anywhere on the body, including areas that rarely see the sun:
- The soles of the feet
- The palms of the hands
- Under the fingernails or toenails
- The scalp
Color may range from brown and black to pink, red, white, or blue, and lesions are often asymmetrical with irregular borders.
The ABCDE rule above is particularly useful for identifying potential melanomas. When detected at an early stage, melanoma is highly curable. When advanced, it can spread to lymph nodes, lungs, liver, brain, and other organs, which is why any suspicious or changing mole deserves prompt evaluation.
Learn more about melanoma symptoms, stages, and treatment options.
Other Types of Skin Cancer
Beyond the three most common types, dermatologists also diagnose and treat several rare skin cancers and a well-known precancerous condition that can progress to skin cancer if it is left alone.
Merkel Cell Carcinoma
Merkel cell carcinoma is a rare but aggressive skin cancer that typically appears as a painless, firm, flesh-colored or bluish-red nodule. It most often develops on the face, head, or neck of older adults and people with weakened immune systems. Because it can grow quickly and is more likely to recur or spread than other skin cancers, prompt diagnosis and treatment are essential.
Dermatofibrosarcoma Protuberans (DFSP)
Dermatofibrosarcoma protuberans is a rare soft-tissue sarcoma that begins in the dermis, the layer of skin beneath the epidermis. It typically presents as a firm, raised area of skin that grows slowly over months or years. The risk of spread to distant sites is low, but DFSP has a high rate of local recurrence, which makes complete surgical removal critical.
Actinic Keratosis (Precancerous)
Actinic keratosis is not a cancer, but it is a well-established precancerous lesion. It appears as a rough, scaly patch on skin damaged by years of cumulative sun exposure. If left untreated, a portion of these lesions can progress to squamous cell carcinoma, which is why dermatologists treat them proactively.
Learn more about actinic keratosis and its treatment options.
Skin Cancer Risk Factors and Prevention
Skin cancer risk reflects a mix of personal characteristics and lifetime sun habits. Knowing the risk factors helps determine how often to schedule professional skin exams. Knowing the prevention steps helps limit how much new damage accumulates from this point forward.
Skin Cancer Risk Factors
- Cumulative or intense UV exposure from sunlight, tanning beds, or sunlamps
- A history of frequent sunburns, particularly blistering burns in childhood or adolescence
- Fair skin, light hair, or light-colored eyes, which provide less natural UV protection
- A personal or family history of skin cancer
- Older age, since damage accumulates over a lifetime, although diagnoses in younger adults are rising
- A weakened immune system, whether from medication or a medical condition
- Living in a high-UV climate such as Florida, where year-round exposure raises lifetime UV load significantly
Skin Cancer Prevention
- Apply broad-spectrum sunscreen with SPF 30 or higher every day, reapplying every two hours during extended outdoor time
- Seek shade during peak UV hours, generally between 10 a.m. and 4 p.m.
- Wear UPF-rated clothing, a wide-brimmed hat, and UV-blocking sunglasses
- Avoid tanning beds and sunlamps entirely
- Perform a head-to-toe skin self-exam each month and note anything new or changing
- Schedule an annual skin cancer screening with a dermatologist, more often if there is a personal or family history of skin cancer
Suncoast Skin Solutions offers skin cancer screenings across Florida, with attention to the sun-exposure patterns specific to patients living in the state’s year-round UV environment. Patients who notice a new or changing spot can request an appointment online or by calling the practice directly.