Stretchmarks, also known as striae, are a way of scarring on the skin with an off-color hue. Over time they will often diminish, but will not recede completely. Stretch marks formed while being pregnant, usually during the last trimester, likely on the belly, but also normally occurring on the breasts, thighs and legs, hips, lower back and bottoms, are known as striae gravidarum.1

Stretch marks are caused by carrying of the dermis. This is often through the rapid stretching of the body associated with rapid growth or rapid weight changes. Stretch marks may also be influenced by hormonal changes associated with puberty, maternity, bodybuilding, or hormone substitute therapy.2

There is no data that creams used when pregnant prevent stretch marks.3 Once they have formed there is no clearly useful treatment although various methods have been tried.4
Striae, or even „stretch marks”, begin while reddish or purple lesions, which can appear anywhere on the body, but are most likely to appear with places where larger amounts of extra fat are stored; the most common places are the abdomen (especially nearby the navel), breasts, upper arms, underarms, back, thighs (both inner and outer), rear, and buttocks. Over time, are likely to atrophy and shed pigmentation. The affected places appear empty, and are gentle to the touch.5

Stretch marks happen in the dermis, the strong middle tissue layer that helps the skin retain its form. No stretch marks will contact form as long as there is support in the dermis; stretching plays a role in where the marks occur and in exactly what direction they run, but there are a number of contributing variables (see: „Causes”, below) to the formation. They can (but never always) cause a burning and also itching sensation, as well as emotive distress. They pose absolutely no health risk in associated with themselves, and do not compromise the human body’s ability to function normally along with repair itself,6 however , they are often considered a cosmetic nuisance.7 Young women are generally affected by far the most and often seek treatment your kids from a dermatologist8 and following pregnancy.9
Stretch marks in a female breast area
Striae distensae on an chronically overweight white male
Striae gravidarum in a white female 2 weeks before delivery
Causesedit
They appear to be caused by stretching out of the skin. This is especially true if you have an increase in cortisone.10

To put it differently, an increase in cortisone levels can easily increase the probability or severity of stretch marks by decreasing the skin’s pliability; specifically, it affects the inside the by preventing the fibroblasts from forming collagen in addition to elastin fibers, necessary to maintain rapidly growing skin taut. This can create a lack of encouraging material as the skin is definitely stretched, and lead to skin and epidermal tearing, which often can produce scarring in the form of stretchmarks. This is particularly the case when there is new tissue growth (which can interfere with the underlying real support of the dermis as well as epidermis, by displacing the actual supportive tissue).

Examples of circumstances where stretch marks are common, likewise given by the Mayo Clinic, include weight gain (in are fat and/or muscle), being pregnant, and adolescent growth spurts, though it is also noted this some medications, as well as other health concerns and diseases, may increase the likelihood of stretch marks appearing. Regarding medication , the Clinic take into account „Corticosteroid creams, lotions as well as pills and chronic use of oral or systemic steroids” as a common contributing element; in the case of medical conditions that can lead to stretch marks, examples given contain Ehlers-Danlos syndrome, Cushing’s syndrome, Marfan syndrome, and „adrenal gland diseases”.

Pregnancyedit
Pregnancy stretch marks, also known as striae gravidarum, is a specific type of scarring of the skin in the abdominal area due to sudden weight gain during pregnancy. About 百分之九十 of women are affected.11

A number of additional factors seem to promote the appearance of stretchmarks: one study of 324 women, done just after they had given labor and birth, demonstrated that low maternal era, high body mass catalog, weight gain over 15 kg (33 pounds) and increased neonatal birth weight were being independently correlated with the event of striae. Teenagers were found to be at the greatest risk of developing severe striae.12

These off-color imperfections are symptoms of pregnancy brought on by the tearing of the dermis, resulting in atrophy and lack of rete ridges.13 These scars often show up as reddish or bluish streaks on the abdomen, and will also appear on the busts and thighs. Some of these striae disappear with time, while others continue to be as permanent discolorations on the body.7

Mechanical distension and rapidly developing parts of the body during pregnancy (such as the belly, breasts, and thighs) are most commonly associated with striae formation. Some have suggested that relaxin and estrogen combined with higher levels of cortisol during pregnancy can cause an accumulation of muocopolysaccharides, which increases water absorption of unificatrice tissue, making it prime intended for cleavage under mechanical stress.812 Presently there also seems to be an association among higher body mass directories and in women with larger babies and the incidence as well as severity of striae. Also, younger women seem to be on higher risk of developing striae during pregnancy.814

Often the prevalence and severity associated with striae gravidarum varies amid populations. The current literature claim that in the general population from the US, there is a 50%-90% occurrance of striae associated with pregnancy,14 partly resulting from the normal hormonal changes regarding pregnancy and partly caused by stretching of skin fibres.315 Lots of women experience striae gravidarum in their first pregnancy. Nearly 45% percent of women develop striae gravidarum before 24 several weeks of gestation.7 Many women who develop lesions on the skin during the first pregnancy will not develop them during afterwards pregnancies. Genetic factors for instance family history and race likewise seem to be predictive in the visual appeal of striae.16

Reductionedit
A systematic review hasn’t found evidence that creams and oils are useful with regard to preventing or reducing striae in pregnancy.3 The safety in pregnancy of one ingredient, Centella asiatica, has become questioned.15 Proof on treatments for minimizing the appearance of the scars right after pregnancy is limited.15