Skin is the largest organ of the body and consists of three layers: the epidermis, dermis and hypodermis. This 3D medical animation depicts the anatomy and physiology of skin and demonstrates the different surgical techniques commonly used to obtain a sample tissue of a suspected skin disorder. A skin biopsy is used to view under a microscope and make a diagnosis of skin pathologies, including warts and moles, skin cancers and other growths, allergic reactions, bacterial or fungal infections, acne, psoriasis, and injuries and scarring. The three types of skin biopsies are shave biopsy, punch biopsy, and excisional biopsy.