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Dermatologists specialize in treating diseases, disorders and injuries of the skin, hair and nails. They treat common conditions such as acne and warts; chronic skin conditions such as eczema and psoriasis; and more serious diseases like skin cancer, according to the AAD.

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The integumentary system comprises the skin and its appendages acting to protect the body from various kinds of damage, such as loss of water or abrasion from outside. The integumentary system includes hair, scales, feathers, hooves, and nails

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Plaque psoriasis is an inherited systemic inflammatory disease of immune dysfunction that causes plaques of elevated, scaling, inflamed skin that is often quite itchy. The plaques are characteristically found on the scalp, elbows, and knees

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A papule is an area of abnormal skin tissue that is less than 1 centimeter around. A papule has distinct borders, and it can appear in a variety of shapes. Papules are often called skin lesions, which are essentially changes in the color or texture of your skin

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A nodule is a growth of abnormal tissue. Nodules can develop just below the skin. ... People can mistake other conditions for nodules, such as small cysts, boils, and abscesses

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A macule is a flat, distinct, discolored area of skin less than 1 cm wide that does not involve any change in the thickness or texture of the skin. A macule occurs without the presence of physical trauma.

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a small gland that secretes sweat, situated in the dermis of the skin. Such glands are found over most of the body. And have a simple coiled tubular structure.

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Crust. Secondary lesions may evolve from primary lesions, or may be caused by external forces such as scratching, trauma, infection, or the healing process. The distinction between a primary and secondary lesion is not always clear.

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a region in an organ or tissue that has suffered damage through injury or disease. Such as a wound, ulcer, abscess, tumor, etc. They are described by their color , appearance , etc.

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Vitamin A is a fat soluble vitamin that is also a powerful antioxidant. Vitamin A plays a critical role in maintaining healthy vision, neurological function, healthy skin, and more. Consuming a diet high in antioxidants is a way to naturally slow aging.

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Medical Definition of Vitamin D: Under normal conditions of sunlight exposure, no dietary supplementation is necessary because sunlight promotes adequate vitamin D synthesis in the skin. Deficiency can lead to bone deformity (rickets) in children and bone weakness (osteomalacia) in adults.

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Keratin is one of a family of fibrous structural proteins. It is the key structural material making up hair, horns, claws, hooves, and the outer layer of human skin. Keratin is also the protein that protects epithelial cells from damage or stress.

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Collagen is a type of protein fiber found abundantly throughout our body. It provides strength and cushioning to many different areas of the body, including the skin. More specifically, collagen is found in our various types of connective tissue such as cartilage, tendons, bones, and ligaments.

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the hypodermis is an epidermal layer of cells that secretes the chitinous cuticle. The term also refers to a layer of cells lying immediately below the epidermis of plants. The hypodermis is beneath dermis which is beneath epidermis. It is used mainly for fat storage.

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the skin.
ANATOMY
the thick layer of living tissue below the epidermis that forms the true skin. Containing blood capillaries, nerve endings, sweat glands, hair follicles, and other structures.

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the outer layer of cells covering an organism, in particular.
ZOOLOGY/ANATOMY
the surface epithelium of the skin of an animal, overlying the dermis.
BOTANY
the outer layer of tissue in a plant, except where it is replaced by periderm.