Application is a method in medicine in which a layer of a substance or material with a therapeutic or cosmetic effect is applied to a certain area of the skin or mucous membrane. Compresses, plasters, ointments, and other forms are used to target the affected area, whether for pain relief, anti-inflammatory treatment, or to speed up healing. Examples include applications with mud, paraffin and medicinal solutions.

This procedure is often used in physiotherapy, cosmetology and dermatology to treat skin diseases, wounds or burns, as well as to improve the condition of the skin and maintain its health. In addition, applications can be used to administer drugs through the skin, which provides local or systemic effects depending on the purpose of treatment.