A lotion is a low- to medium-viscosity, topical preparation intended for application to unbroken skin; creams and gels have a higher viscosity. Most lotions are oil-in-water emulsions, but water-in-oil lotions are also formulated. Lotions are usually applied to external skin with bare hands, a clean cloth, cotton wool or gauze; creams and gels usually only with one's fingers or palms. Many lotions, especially Hand Creams and Face cream are formulated not as a medicine delivery system, but simply to smooth and soften the skin these are particularly popular with the aging and aged demographic groups, and in the case of face usage, can also be classified as a cosmetic in many cases.