Sores that do not heal usually represent cancer, but basal cell carcinoma may appear in other forms, such as pearly bumps, flat scaly patches or a white, waxy scar, notes the Mayo Clinic. All crusty bumps, patches or skin eruptions that cause worry warrant seeking medical attention.
Although basal cell carcinoma typically results from excessive exposure to ultraviolet rays, symptoms may take years to appear, states WebMD. Patients may mistake initial appearances of the cancer for ordinary bumps or pimples. Basal cell cancers grow slowly, but any skin anomaly that lingers more than a couple of weeks needs medical attention. Fine blood vessels sometimes surround basal cell cancers, which are typically fragile and prone to bleeding.