Cumulative sun exposure increases the risk of basal cell carcinoma and squamous cell carcinoma. Basal cell carcinoma is the most common skin cancer. It usually occurs in persons who were exposed to great amounts of sunlight and is twice as likely in men than women.
Incidence increases with age. It is a nonmetastasizing tumour. seen most frequently on head and neck (frequently sun exsposed areas). Overtime the lesion may develop a central depression and ulcerate. Squamous cell carcinomas are malignant tumours of the outer epidermis. The mechanisms of squamous cell carcinoma development are unclear. Severe sun exposure (intermittent) with blistering increases the risk of malignant melanoma. malignant melanoma risk factors include family history, presence of blonde or red hair, presence of marked freckling on upper back, history of three or more blistering sunburns before 20 years of age, history of 2 or more years of an outdoor job as a teenager, and presence of actinic keratosis.
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