It's not clear that all UV is a complete carcinogen. Narrowband UVB is used for the treatment of psoriasis. It certainly causes a change in your natural skin co

It's not clear that all UV is a complete carcinogen. Narrowband UVB is used for the treatment of psoriasis. It certainly causes a change in your natural skin colour but studies have not found that it elevates the risk of skin cancer e.g.: https://www.ncbi.nlm.nih.gov/pubmed/18834483 https://www.ncbi.nlm.nih.gov/pubmed/18834483