scar


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scar,

fibrous connective tissueconnective tissue,
supportive tissue widely distributed in the body, characterized by large amounts of intercellular substance and relatively few cells. The intercellular material, or matrix, is produced by the cells and gives the tissue its particular character.
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 that forms at the site of injury or disease in any tissue of the body. Scar tissue may replace injured skin and underlying muscle, damaged heart muscle, or diseased areas of internal organs such as the liver. Dense and thick, it is usually paler than the surrounding tissue because it is poorly supplied with blood, and although it structurally replaces destroyed tissue, it cannot perform the functions of the missing tissue. Scar tissue may therefore limit the range of muscle movement or prevent proper circulation of fluids when affecting the lymphatic or circulatory system. Extensively scarred tissue may lose its ability to function normally.

Scar

 

the end result of the development of connective tissue at the site of the healing of a wound or ulcer. The timely surgical treatment of an incised wound with smooth margins leaves a soft and sometimes barely noticeable linear scar. Large wounds that suppurate and heal by second intention form granulations and subsequently epithelize, resulting in the formation of broad scars that are attached to underlying tissues.

Excessive scar tissue that is elevated above the skin surface is called a keloid. Extensive scars formed after burns or the prolonged healing of suppurative wounds in the area of extremity joints or on the neck result in a limitation of mobility, or contracture; these scars require plastic surgery. Scars that develop after the healing of gastric or duodenal ulcers often lead to the deformation of the stomach and duodenum, the disruption of evacuation from the stomach, and the development of pyloric stenosis.

scar

[skär]
(geology)
A steep, rocky eminence, such as a cliff or precipice, where bare rock is well exposed. Also known as scaur; scaw.
(medicine)
A permanent mark on the skin or other tissue, formed from connective-tissue replacement of tissue destroyed by a wound or disease process.

scar

1
1. any mark left on the skin or other tissue following the healing of a wound
2. the mark on a plant indicating the former point of attachment of a part, esp the attachment of a leaf to a stem

scar

2
1. an irregular enlongated trench-like feature on a land surface that often exposes bedrock
2. a similar formation in a river or sea
References in periodicals archive ?
Types of scars | Flat, pale scars Initially, they may be red or dark and raised, but will become paler and flatter over time.
The Global Scar Removal Treatment Market is Likely to Reach a Lucrative Valuation of USD 15 Billion By 2022 Due to the Growing Aesthetic Awareness Among People.
Scar babies can never be born unless the issues that led to their conception are solved.
However, in a separate study, they found acne scarring and repair was an ongoing process: Of 32 patients with moderate inflammatory acne studied for 6 months, 36% of scars that were discovered within the study period were not present at follow-up (J Drugs Dermatol.
Majority 105 (95.45%) of neonates developed visible scar after 12 wks., of vaccination and 5 (4.5%) had no visible scar representing scar failure rate of 4.5%.
By Scar Global Assessment at week 24, 32.9% of half faces treated with the combination product were rated clear or almost clear, compared with 16.4% with vehicle.
Trichloroacetic acid (TCA) peel is an effective and inexpensive peeling agent that can be focally applied on atrophic icepick acne scars as it causes coagulation of epidermal and dermal proteins, and necrosis of collagen up to the upper reticular dermis.6 In a study conducted by Lee et al.6 high concentration of TCA (100%) was applied on icepick acne scars showing that healing occurred more rapidly and with fewer complications.
Changes in biomechanical properties (properties that allow the skin to protect and conform to the body that it covers)of skin may be due to trauma, ultraviolet light, mechanical and chemical strain, nicotine, alcohol, genetic predispositions, diseases, and others, is also an important determinant in scar formation.
As the scar progresses, the score will either increase if the scar becomes worse or decrease as it reduces in activity, providing the clinician and the patient with an indicator of scar development and effectiveness of previous treatments used on the original wound.
Based on Goodman and his collages baron classification system, all patients were with moderate-to-severe atrophic scars, 31% had moderate acne scar, and 9% with severe grade of acne scars.
FRIDAY, March 9, 2018 (HealthDay News) -- Botulinum toxin injections in surgical wound closure immediately after surgery improve facial surgery scars, according to a small study published in the March issue of Plastic and Reconstructive Surgery.