A device includes an assembly including a non-rotatable applicator. The applicator includes an application surface configured to treat an area of the human body such as the skin. The applicator further includes at least one material with thermal properties such that, when the at least one material is heated to a temperature above 30° C. and which temperature does not cause thermal damage to the skin when the application surface is contacted with the skin for 15 seconds, the application surface maintains, after this application, a temperature above or equal to 30° C. The applicator can include a grasping surface and a cavity with a compound inside. The applicator can typically be configured to withstand repeated heating, especially by microwave oven.