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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]
Frequency. 1 in 5,000 [1] Ehlers–Danlos syndromes (EDS) are a group of 13 genetic connective-tissue disorders. [7] Symptoms often include loose joints, joint pain, stretchy velvety skin, and abnormal scar formation. [1] These may be noticed at birth or in early childhood. [3]
Pseudoathletic appearance. Pseudoathletic appearance is a medical sign meaning to have the false appearance of a well-trained athlete due to pathologic causes (disease or injury) instead of true athleticism. [1][2] It is also referred to as a Herculean or bodybuilder -like appearance. [3] It may be the result of muscle inflammation (immunity ...
Psoriasis is a long-lasting, noncontagious autoimmune disease characterized by patches of abnormal skin. [4][5] These areas are red, pink, or purple, dry, itchy, and scaly. [8][3] Psoriasis varies in severity from small localized patches to complete body coverage. [3] Injury to the skin can trigger psoriatic skin changes at that spot, which is ...
6,400 (with chickenpox) [ 5 ] Shingles, also known as herpes zoster, is a viral disease characterized by a painful skin rash with blisters in a localized area. [ 2 ][ 6 ] Typically the rash occurs in a single, wide mark either on the left or right side of the body or face. [ 1 ] Two to four days before the rash occurs there may be tingling or ...
Deaths. 176,000 (2015) [8] A burn is an injury to skin, or other tissues, caused by heat, cold, electricity, chemicals, friction, or ionizing radiation (such as sunburn, caused by ultraviolet radiation). [5][9] Most burns are due to heat from hot liquids (called scalding), solids, or fire. [10] Burns occur mainly in the home or the workplace.
Leprosy, also known as Hansen's disease (HD), is a long-term infection by the bacteria Mycobacterium leprae or Mycobacterium lepromatosis. [4][7] Infection can lead to damage of the nerves, respiratory tract, skin, and eyes. [4] This nerve damage may result in a lack of ability to feel pain, which can lead to the loss of parts of a person's ...
Classification. ALS is a motor neuron disease, which is a group of neurological disorders that selectively affect motor neurons, the cells that control voluntary muscles of the body. [3] Other motor neuron diseases include primary lateral sclerosis (PLS), progressive muscular atrophy (PMA), progressive bulbar palsy, pseudobulbar palsy, and ...