To obtain the subject lotion not only exhibiting an excellent effect on prevention and improvement of skin pigmentation, but also having no anxiety about skin and safely usable by including a specific compound, etc.

This lotion contains 0.005-10 wt.% based on the whole preparation of one or more kinds selected from a compound of the formula (R1, R5, R9 and R13 are each H or a 1-4C alkyl; R2 to R4, R6 to R8, R10 to R12 and R14 to R16 are each H, an acyloxy, a saccharide residue or a 1-4C alkyloxy) and its physiologically acceptable salt. The compound is preferably obtained by mixing chemical equivalents of resorcinol and acetaldehyde and reacting the mixture in the presence of an chemical equivalent of hydrochloric acid in a nitrogen gas stream at 70°C for about 10 hours, sufficiently cleaning precipitate with water and drying, etc.