Scar

scarringscar tissuescarscicatricecicatricescicatricialcicatrixfibroplasiascar-tissueblemish
A scar is an area of fibrous tissue that replaces normal skin after an injury.wikipedia
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Fibrosis

fibroticscarringfibrogenic
A scar is an area of fibrous tissue that replaces normal skin after an injury.
In response to injury, this is called scarring, and if fibrosis arises from a single cell line, this is called a fibroma.

Skin

cutaneousskin cellanimal skin
A scar is an area of fibrous tissue that replaces normal skin after an injury.
Severely damaged skin may heal by forming scar tissue.

Healing

healing factorhealrecovery
Thus, scarring is a natural part of the healing process.
The replacement can happen in two ways: by regeneration in which the necrotic cells are replaced by new cells that form "like" tissue as was originally there; or by repair in which injured tissue is replaced with scar tissue.

Keloid

keloidskeloid scarsKeloid scar
Two of the most common types are hypertrophic and keloid scarring, both of which experience excessive stiff collagen bundled growth overextending the tissue, blocking off regeneration of tissues.
is the formation of a type of scar which, depending on its maturity, is composed mainly of either type III (early) or type I (late) collagen.

Acne

acne vulgariscystic acneAcne scarring
They can be caused by surgery, accident, acne or, sometimes, body piercings.
It is characterized by blackheads or whiteheads, pimples, oily skin, and possible scarring.

Body piercing

piercingpiercingsear piercing
They can be caused by surgery, accident, acne or, sometimes, body piercings.
Body piercing is an invasive procedure with some risks, including allergic reaction, infection, excessive scarring and unanticipated physical injuries, but such precautions as sanitary piercing procedures and careful aftercare are emphasized to minimize the likelihood of encountering serious problems.

Ehlers–Danlos syndromes

Ehlers-Danlos syndromeEhlers–Danlos syndromeEhlers Danlos Syndrome
It can also be caused by a genetic connective tissue disorder, such as Ehlers–Danlos syndrome.
Symptoms may include loose joints, joint pain, stretchy skin, and abnormal scar formation.

Hypertrophic scar

hypertrophic scarshypertrophicRadiation-induced hypertrophic scar
Hypertrophic scars occur when the body overproduces collagen, which causes the scar to be raised above the surrounding skin.
A hypertrophic scar is a cutaneous condition characterized by deposits of excessive amounts of collagen which gives rise to a raised scar, but not to the degree observed with keloids.

Collagen

procollagencollagenscollagen fibers
Scar tissue is composed of the same protein (collagen) as the tissue that it replaces, but the fiber composition of the protein is different; instead of a random basketweave formation of the collagen fibers found in normal tissue, in fibrosis the collagen cross-links and forms a pronounced alignment in a single direction.

Myocardial infarction

heart attackheart attacksacute myocardial infarction
A myocardial infarction, commonly known as a heart attack, causes scar formation in the heart muscle, which leads to loss of muscular power and possibly heart failure.
A collagen scar forms in their place.

Elastic fiber

elastic fiberselastic tissueelastic
Scar tissue also lacks elasticity unlike normal tissue which distributes fiber elasticity.
Elastic fibers are absent from scarring, keloids and dermatofibromas and they are decreased greatly, or are absent in anetodermas.

Chickenpox

chicken poxvaricellaCongenital varicella syndrome
This type of scarring is often associated with acne, chickenpox, other diseases (especially Staphylococcus infection), surgery, certain insect and spider bites, or accidents.

Mederma

Research shows the use of vitamin E and onion extract (sold as Mederma) as treatments for scars is ineffective.
Mederma is a topical product used to improve scar appearance.

Burn

burnsthird-degree burnsthird-degree burn
Healing can require up to eight weeks and scarring may occur.

Wound healing

wound repairscabvulnerary
Scars result from the biological process of wound repair in the skin, as well as in other organs and tissues of the body.
Hypoxia also contributes to fibroblast proliferation and excretion of growth factors, though too little oxygen will inhibit their growth and deposition of ECM components, and can lead to excessive, fibrotic scarring.

Photorejuvenation

laser resurfacingskin resurfacingLaser
Once the skin has leveled, treatments such as laser resurfacing, microdermabrasion or chemical peels can be used to smooth out the scarred tissue.
It is used for the treatment of wrinkles, solar lentigenes, sun damage, scarring (acne scars and surgical scars), stretch marks, actinic keratosis, and telangiectasias.

Rete pegs

rete ridgesRete pegepidermal projections that interdigitate with dermis
In scars rete pegs are lost; through a lack of rete pegs scars tend to shear easier than normal tissue.
Scar tissue lacks rete pegs and scars tend to shear off more easily than normal tissue as a result.

Inflammation

inflammatoryinflammatory responseinflamed
Prolonged inflammation, as well as the fibroblast proliferation can occur.
Fibrous scarring occurs in these areas of damage, forming a scar composed primarily of collagen.

Dye laser

dye laserspulsed dye laserdye
Nonablative lasers, such as the 585 nm pulsed dye laser, 1064 nm and 1320 nm Nd:YAG, or the 1540 nm Er:Glass are used as laser therapy for hypertrophic scars and keloids.
They are used to treat port-wine stains and other blood vessel disorders, scars and kidney stones.

Massage

massage therapymasseurmasseuse
Theories behind what massage might do include enhanced skeletal muscle regrowth and remodeling, blocking nociception (gate control theory), activating the parasympathetic nervous system, which may stimulate the release of endorphins and serotonin, preventing fibrosis or scar tissue, increasing the flow of lymph, and improving sleep.

Vitamin E

EHypervitaminosis EVitamins E
Research shows the use of vitamin E and onion extract (sold as Mederma) as treatments for scars is ineffective.
Although there is widespread use of tocopheryl acetate as a topical medication, with claims for improved wound healing and reduced scar tissue, reviews have repeatedly concluded that there is insufficient evidence to support these claims.

Organ (anatomy)

organorgansviscera
Scars result from the biological process of wound repair in the skin, as well as in other organs and tissues of the body.

Tissue (biology)

tissuetissuesbiological tissue
Scars result from the biological process of wound repair in the skin, as well as in other organs and tissues of the body.

Lesion

lesionsbrain lesionslesion studies
With the exception of very minor lesions, every wound (e.g., after accident, disease, or surgery) results in some degree of scarring.

Accident

accidentsfreak accidentmisadventure
With the exception of very minor lesions, every wound (e.g., after accident, disease, or surgery) results in some degree of scarring.