Ultraviolet radiation from sun exposure is the primary environmental cause of<unk> . This can occur in professions such as farming. Other risk factors that play a role include: * Light<unk>  color * Age * Smoking tobacco * HPV infections increase the risk of squamous-cell<unk> . * Some genetic syndromes including congenital melanocytic nevi syndrome which is characterized by the presence of nevi (birthmarks or moles) of varying size which are either present at birth, or appear within 6 months of birth. Nevi larger than 20 mm (3/4") in size are at higher risk for becoming cancerous. * Chronic non-healing wounds. These are called Marjolin's ulcers based on their appearance, and can develop into squamous-cell<unk> . * Ionizing radiation such as X-rays, environmental carcinogens, and artificial UV radiation (e.g. tanning beds). It is believed that tanning beds are the cause of hundreds of thousands of basal and squamous-cell<unk> . The World Health Organization now places people who use artificial tanning beds in its highest risk category for<unk> . Alcohol consumption, specifically excessive drinking increase the risk of sunburns. * The use of many immunosuppressive medications increases the risk of<unk> . Cyclosporin A, a calcineurin inhibitor for example increases the risk approximately 200 times, and azathioprine about 60 times. * Deliberate exposure of sensitive<unk>  not normally exposed to sunlight during alternative wellness behaviors such as perineum sunning.
Skin cancer
Cancer
Breast disease
Oral cancer
Squamous cell skin cancer
Breast cancer
Melanosis
Dermatitis