It is primarily caused by chronic sun exposure and therefore mainly affects older individuals, although it may also occur in younger people who have a genetic predisposition or other factors that make their skin more sensitive to ultraviolet radiation.
Basal cell carcinoma does not behave like most cancers, as it almost never metastasizes and instead grows locally, gradually destroying the surrounding tissues.

The earliest signs may include a flat red patch, a small lump, a spot that bleeds when rubbed with a towel, a small ulcer (sore), or a persistent crust on the skin that does not heal over time.
Treatment is usually surgical, although in early stages it may be managed with topical creams, cryotherapy, or cauterization.
Once completely removed, regular follow-up is generally not required.