The mechanism of<unk>  varies by product. Three categories of<unk> s are used: water repellent<unk> s, water-soluble<unk> s, and<unk> s designed for special applications. Moisturizing<unk>  acts as a lubricating film on the skin to prevent depletion of water (transepidermal water loss) in the skin's outermost layer, the stratum corneum. This may have a protective effect against irritant contact dermatitis and allergic contact dermatitis, which often result from such depletion. These<unk> s can be classed as occlusives (which prevent loss through a hydrophobic effect), humectants (which absorb water from the dermis and environment due to hygroscopy), or hydrating agents (which both moisturize the skin and maintain its water content).<unk> s may contain substances such as zinc oxide, talc or kaolin to layer over the skin. Other<unk> s are intended to protect the skin from some external agents, though they are not sufficient to provide a complete<unk> .
Barrier cream
Topical medication
Sunscreen
Dermal adhesive
Topical steroid
Natural skin care
Whitfield's ointment
Insect repellent