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Psoriasis is a chronic inflammatory skin disease affecting approximately 2% of the population worldwide. In the past decade, many studies have drawn attention to comorbid conditions in psoriasis. This literature review examines the epidemiological evidence, pathophysiological commonalities, and therapeutic implications for different comorbidities of psoriasis. Cardiovascular disease, obesity, diabetes, hypertension, dyslipidemia, metabolic syndrome, nonalcoholic fatty liver disease, cancer, anxiety and depression, and inflammatory bowel disease have been found at a higher prevalence in psoriasis patients compared to the general population. Because of the wide range of comorbid conditions associated with psoriasis, comprehensive screening and treatment must be implemented to most effectively manage psoriasis patients.

Ultraviolet B radiation exposure is responsible for the majority of natural vitamin D stores in humans. The physiologic role of vitamin D in health and disease is continually expanding, and at the same time the population that is vitamin D deficient is increasing. The environmental characteristics and personal physical traits that contribute to vitamin D3 synthesis from sun exposure are discussed, and the effects of photoprotection on vitamin D status are examined. It is concluded that sunscreen, in the manner used by the general public, does not cause vitamin D insufficiency. Implementing guidelines suggesting sun exposure duration for sufficient vitamin D3 production is limited by the complex interaction of contributory factors, and no recommendation can be made that is both safe and accurate enough for general public usage.

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