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The skin weighs an average of four kilograms, covers an area of two square metres, and is made of three distinct layers: the epidermis, dermis, and subcutaneous tissue. [1] The two main types of human skin are: glabrous skin, the hairless skin on the palms and soles (also referred to as the "palmoplantar" surfaces), and hair-bearing skin. [3]
Fitzpatrick scale. The Fitzpatrick scale (also Fitzpatrick skin typing test; or Fitzpatrick phototyping scale) is a numerical classification schema for human skin color. It was developed in 1975 by American dermatologist Thomas B. Fitzpatrick as a way to estimate the response of different types of skin to ultraviolet (UV) light. [2] It was ...
The human skin is the outer covering of the body and is the largest organ of the integumentary system. The skin has up to seven layers of ectodermal tissue guarding muscles, bones, ligaments and internal organs. Human skin is similar to most of the other mammals ' skin, and it is very similar to pig skin. Though nearly all human skin is covered ...
Skin condition. A skin condition, also known as cutaneous condition, is any medical condition that affects the integumentary system —the organ system that encloses the body and includes skin, nails, and related muscle and glands. [ 1] The major function of this system is as a barrier against the external environment. [ 2]
Blaschko's lines, also called the lines of Blaschko, are lines of normal cell development in the skin. These lines are only visible in those with a mosaic [ 1][ 2][ 3] skin condition or in chimeras where different cell lines contain different genes. These lines may express different amounts of melanin, [ 4] or become visible due to a differing ...
Sex differences in human physiology are distinctions of physiological characteristics associated with either male or female humans. These differences are caused by the effects of the different sex chromosome complement in males and females, and differential exposure to gonadal sex hormones during development. Sexual dimorphism is a term for the ...
The human body is composed of elements including hydrogen, oxygen, carbon, calcium and phosphorus. These elements reside in trillions of cells and non-cellular components of the body. The adult male body is about 60% total body water content of some 42 litres (9.2 imp gal; 11 US gal).
Seborrhoeic dermatitis (also spelled seborrheic dermatitis in American English) is a long-term skin disorder. [ 4] Symptoms include flaky, scaly, greasy, and occasionally itchy and inflamed skin. [ 2][ 3] Areas of the skin rich in oil -producing glands are often affected including the scalp, face, and chest. [ 4]