What function do dermal papillae have?

Dermal papillae are small, nipple-like projections found in the upper layer of the dermis, which interlock with the epidermis. Their primary function is to increase the surface area for the exchange of oxygen, nutrients, and waste products between the dermis and epidermis. Additionally, they contain capillaries, nerve endings, and sensory receptors, playing a key role in thermoregulation and tactile sensation. This structure also contributes to the formation of fingerprints, enhancing grip and touch perception.