The skin is the largest organ of the body, weighing approximately 4 kg for an adult and covering an area of about 2 square meters. It has several important functions, including providing protection, regulating temperature, and serving as a sensory organ. The skin is composed of three main layers - the epidermis, dermis, and hypodermis. The epidermis is made up of stratified squamous epithelium with the basal, prickle, and granular cell layers. Below this is the dermis containing collagen, elastic fibers, and appendages. The deepest layer is the hypodermis, which stores fat. The skin contains several cell types including keratinocytes, melanocytes, Langerh