Abstract: The inventions relate to cosmetology and are intended to increase a cosmetic effect. A mask comprises a cream-type cosmetic agent and an additional reagent, which are isolated from one another. The agent contains a water-soluble biocompatible polymer which has a mass in the range of 50,000-1,000,000 Da and is capable of entering into a cross-polymerisation reaction. The reagent consists of a substance-electrolyte solution containing multicharged ions. The mass ratio of polymer and substance-electrolyte is from 10:1 to 1:1 respectively. A method involves separately applying to the skin the cream-type agent and then the additional reagent on top.