Aspen Emla 25 mg cream 30 gEMLA works by numbing the surface of the skin for a short time. It is used on the skin before certain medical procedures. It helps to induce a temporary loss of pain sensation on the skin, yet you may feel pressure or touch in that area. Adults, adolescents and children The product can be used to numb the skin before: By injecting an injection needle (e. g. before an injection during vaccination or blood sampling). Smaller performances on the skin.