The invention is directed to the use of at least one peptide of formula: X—(Xaa1)n-Pro*-(Xaa2)m-Y (I) With: —n=0, 1 or 2； —m=0 or 1 and if m=0 then n≠0-Xaai is: —An hydrophobic amino acid； —A polar amino acid； —or Glycine (Gly, G)； When n=2 the two amino acids Xaa1 can be the same or different； —Xaa2 is: —An hydrophobic amino acid； —A basic amino acid Glycine (Gly, G) or Serine (Ser, S)； —At the N terminal end of the peptide, X is selected from H, —CO—R1 and —SO2—R1； —At the C terminal end of the peptide, Y is selected from OH, OR1, NH2, NHR1 or NR1R2, R1 and R2 being independently from each other, selected from an alkyle, aryle, aralkyle, alkylaryl, alkoxy and aryloxy group； Excluding the peptides where X=H and Y=OH, for a non therapeutical cosmetic pro-pigmenting treatment of skin.
