Abstract: A cap to be placed on a head of a device for treating the skin of a user includes an inner part to be removably attached to the head of the device, an outer part to be placed against the skin of the user and an interior disposed between the inner and outer parts. A product is disposed in the interior for application to the skin of the user and a covering, such as a membrane which is disposed on the outer part or a sterilized pack, is removable before use. An assembly having the device and the cap is also provided.

Abstract: A skin observation system includes a helmet to be placed over the head of a user, a mirror disposed within the helmet in a direct line of sight of the user wearing the helmet, at least one lighting device disposed within the helmet for illuminating the face of the user, a shield disposed within the helmet for shielding the eyes of the user from light emitted by the at least one lighting device, and a filter disposed within the helmet for filtering components of the light emitted by the at least one lighting device. The lighting device is preferably a plurality of laser diodes and the filter is preferably a UV filter. The mirror preferably has a concave surface facing the user.