Several studies show that blue and red light are effective in treating psoriasis and eczema. They eliminate the cells that cause inflammation of the skin. After a few light therapy sessions, these cells calm down and the symptoms are much less visible.
Eczema is a skin condition that manifests as erythema or redness on the skin.
Exposure to red light helps remove hyperactive skin cells, which are the main cause of inflammatory skin. The red light penetrates deeply into your skin and chemically reacts with damaged tissue. Light helps heal signs of eczema over time.
Kleinpenning M. M. et al. – Efficacy of blue light vs. red light in the treatment of psoriasis: a double-blind, randomized comparative study: blue light versus red light in psoriasis.
https://www.ncbi.nlm.nih.gov/pubmed/21435024
Pfaff S. et al. – Prospective randomized long-term study on the efficacy and safety of uv-free blue light for treating mild Psoriasis Vulgaris.
https://www.ncbi.nlm.nih.gov/pubmed/26044167