The development of a basal cell carcinoma appears to be mainly related to sunlight exposure.
Lesions occur in exposed areas of the skin (75% occur in the head and neck), and the incidence is increased in parts of the world with increased sunlight. Similarly there is an increased incidence in Caucasians, whose skin is perhaps least protected against the harmful affects of the sun.
Basal cell carcinomas may also arise in association with Gorlin's syndrome. Patients with this condition appear to have a great tendency to develop basal cell epitheliomata.
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