Wetness from perspiration, urine, or feces can make the skin too soft and more likely to be injured by pressure. Moisture from sweating or incontinence will hydrate the skin, dissolve the molecular collagen cross links of the dermis, and soften the stratum corneum. Another result of skin hydration is the rapid increase of the epidermal friction coefficient, which promotes adhesion of the skin to the support surface and increase shear, easy sloughing, and ulceration.