Cosmetic or pharmaceutical composition containing microspheres of polymers or of fatty substances filled with at least one active product

A pharmaceutical or cosmetic composition for topical application to the skin comprises, in a pharmaceutically or cosmetically acceptable carrier for topical application to the skin, microspheres of a polymer or fatty substance having a melting point approximately higher than 50.degree. C., said microspheres being filled with at least one pharmaceutically or cosmetically active product and having a size such that they enter the sebaceous follicle on topical application to the skin and selectively and progressively reach the follicular canal whereby the said pharmaceutically or cosmetically active product diffuses into the follicular canal and surrounding tissue and the solid substrate forming said microspheres is rejected thereby avoiding any undesirable reaction between the organism and said solid substrate, at least 80 weight percent of said microspheres having a diameter ranging from 3 .mu.m to 10 .mu.m.