Skin physiology refers to the study of the skin's structure and function. The skin is the largest organ of the body, composed of three main layers: the epidermis, dermis, and hypodermis. Each layer plays a vital role in protecting the body, regulating temperature, and providing sensory information. The epidermis acts as a barrier, while the dermis contains blood vessels, nerves, and connective tissue. Additionally, skin physiology involves the skin's ability to heal and regenerate. It contains specialized cells, such as keratinocytes and melanocytes, which contribute to skin health and pigmentation. The skin also produces sebum to maintain moisture and protect against pathogens, highlighting its essential role in overall health.