Skin Cancer Warning Signs Every Canadian Should Know

Skin cancer is the most common type of cancer in Canada. The Canadian Cancer Society estimates that more than 80,000 Canadians are diagnosed with non-melanoma skin cancer annually. Early detection is critical for successful treatment. The ABCDE rule helps identify potentially cancerous moles: Asymmetry (one half does not match the other), Border (irregular or blurred edges), Colour (uneven colour - brown, black, tan, red, or blue), Diameter (larger than 6 mm, though melanomas can be smaller), and Evolution (changes in size, shape, or colour over time). Other warning signs include a sore that does not heal within a few weeks, a new growth that increases in size, a spot that becomes itchy, tender, or starts bleeding, and a shiny, waxy, or scar-like bump. Risk factors include fair skin, history of sunburns, extensive sun exposure, family history of skin cancer, and a large number of moles. The Canadian Dermatology Association recommends regular self-examination of your skin. If you notice any changes, consult a healthcare provider promptly. A physician can conduct an initial assessment - even through telehealth - and refer you to a dermatologist if needed. Prevention includes daily broad-spectrum sunscreen (SPF 30+), protective clothing, and avoiding indoor tanning beds. *This article is for informational purposes only.*

This article is for informational purposes only and does not constitute medical advice. Content reviewed by licensed Canadian physicians. Last updated February 2026.