The liquid product is changed by means of a dispenser system into a fine-pore foam containing concentrated urea and lactic acid, without the use of propellants and is used for precise and rapid softening of hard skin. After just five minutes, the softened skin can be easily removed, so treatment time is significantly reduced. The foam produced remains stable on the skin and does not swell up. This prevents unintentional softening of the surrounding skin. Antimicrobial. Unperfumed.