Skin cancer
Most common cancer in humans, primarily caused by UV radiation.
Skin cancers are cancers that arise from the skin due to the development of abnormal cells that can invade or spread to other parts of the body. They occur when skin cells grow uncontrollably, forming malignant tumors, and are the most commonly diagnosed form of cancer in humans. The primary cause is prolonged exposure to ultraviolet (UV) radiation from the sun or tanning devices.
- types
- Three main types: basal-cell (BCC), squamous-cell (SCC), and melanoma
- global_cases
- Accounts for at least 40% of all cancer cases
- annual_nmsc_cases
- At least 2–3 million cases per year (nonmelanoma skin cancer)
- survival_rate
- Over 86% (UK) and over 90% (US) survive more than 5 years for melanoma
- primary_cause
- Ultraviolet radiation from sun or tanning devices
Lore & Background
Skin cancers arise from abnormal cell growth in the skin, forming malignant tumors. The three main types are basal-cell skin cancer (BCC), squamous-cell skin cancer (SCC), and melanoma. BCC grows slowly and rarely spreads, often appearing as a painless raised area with small blood vessels. SCC is more likely to spread, presenting as a hard lump with a scaly top. Melanoma is the most aggressive, with signs including changes in mole size, shape, color, or bleeding.
Reader's Guide
More than 90% of cases are caused by UV radiation from the Sun, with exposure increasing since the industrial revolution partly due to ozone depletion. Tanning beds are another common source. Decreasing UV exposure and using sunscreen appear effective for preventing melanoma and SCC, though it is unclear if sunscreen affects BCC risk. Nonmelanoma skin cancer is usually curable via surgical removal, while melanoma treatment may involve surgery, chemotherapy, radiation, or targeted therapy. Skin cancer is the most common cancer globally, with nonmelanoma types accounting for at least 40% of cases. Melanoma has high survival rates, with over 86% in the UK and over 90% in the US surviving more than 5 years. The three main types have become more common since the late 20th century, especially in predominantly white populations.
Did You Know?
- Basal-cell and squamous-cell skin cancers rarely result in death, causing less than 0.1% of all cancer deaths in the United States.
- Melanoma is predominantly caused by UVA radiation via indirect DNA damage from free radicals and reactive oxygen species.
- White people in Australia, New Zealand, and South Africa have the highest rates of melanoma in the world.
- Between 20% and 30% of melanomas develop from moles.
Frequently Asked Questions
Who is Skin cancer?
Skin cancer is the most frequently diagnosed malignancy in humans, arising when skin cells begin multiplying without control and form tumours that can invade surrounding tissue or metastasise. It represents at least 40 % of all cancer cases diagnosed worldwide.
What is the primary 'trigger' that brings Skin cancer into the story?
Prolonged exposure to ultraviolet radiation—whether from sunlight or artificial tanning devices—is the leading cause, as it damages the DNA in skin cells and sets off uncontrolled growth.
How does Skin cancer's story typically end for a patient?
Prognosis is generally favourable: in the UK more than 86 % of melanoma patients survive beyond five years, and in the US the figure exceeds 90 %. Early detection and surgical removal of the tumour are the most common ways the narrative resolves positively.
Why is Skin cancer considered a major 'villain' in the medical canon?
Its sheer prevalence makes it the single most common cancer in the human population, and its link to an everyday environmental factor (UV light) means virtually anyone is at risk. That combination of frequency and preventable cause is what keeps it at the top of public-health discussions.
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