Method of preventing darkening of skin or inhibiting melanization of melanin monomer and polymerization inhibitor of biological dihydroxyindole compound

摘要

A method of preventing darkening of the skin or inhibiting melanization caused by the irradiation of the melanin monomers with long wavelength ultraviolet rays having a wavelength of 320 - 400 nm as well as a polymerization inhibitor of a biological dihydroxyindole compound comprising 3-0-ethyl ascorbic acid and an external skin treatment composition containing the same.