They reported that over 1-third of the respondents were unaware of the role of vitamin D in the body-a significant finding in light of the fact that vitamin D levels were insufficient in 40% of a subsample of respondents in whom these were tested. 2 published the results of a study based on an online questionnaire designed to investigate the understanding of the role of vitamin D in the general population.

Charpy 1 published the first study linking vitamin D levels and lupus vulgaris in 1945.

Today, we know that the role of vitamin D in the body goes beyond the regulation of bone mineral metabolism, making the function of this vitamin important to a wide range of medical specialists. Subsequently, in 1882, Sniadecki realized the importance of exposure to sunlight for the prevention and cure of rickets. Rickets, a condition caused by vitamin D deficiency, was first described by Glisson, DeBoot and Whistler in the seventeenth century. In this review, we provide an overview of the most important and most recent information regarding the relationship between vitamin D and skin disease and discuss the importance of assessing individual vitamin D status and correcting deficiencies. Also of interest is the importance of vitamin D as adjuvant therapy in patients on long-term treatment with corticosteroids. Of particular interest are the latest discoveries about the role of vitamin D in skin diseases such as lupus erythematosus, ichthyosis, atopic dermatitis, hidradenitis suppurativa, acne, alopecia areata, androgenetic alopecia, melanoma, and nonmelanoma skin cancer. As dermatologists, we need to understand, among other aspects, how vitamin D is synthesized and the main sources in humans, as well as plasma levels and the factors that can modify them.

In recent years, the growing interest in the role played by vitamin D in skin disease has given rise to the publication of many studies of the relationship between this vitamin and certain skin conditions.

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