Stretch marks

Stretch marks, also known as Striae or Striae distensae[1], are a form of scarring on the skin with an off-color hue. Over time they may diminish, but will not disappear completely. Stretch marks are caused by tearing of the dermis during periods of rapid growth of the body, such as during puberty or pregnancy. In pregnancy they usually form during the last trimester, and usually on the belly, but also commonly occur on the breasts, thighs, hips, lower back and buttocks; these are known as striae gravidarum.[2] Stretch marks may also be influenced by the hormonal changes associated with puberty, pregnancy, bodybuilding, or hormone replacement therapy. There is no evidence that creams used during pregnancy prevent stretch marks.[3] Once they have formed there is no clearly effective treatment, though various methods have been attempted and studied.[4]

"Striae" is also a general term referring to thin, narrow grooves or channels, or a thin line or band especially if several of them are parallel or close together.
"Stria" redirects here. For inner ear structure, see Stria vascularis of cochlear duct. For brain structure, see Stria terminalis.
Stretch marks
Other namesstria, striae distensae
SpecialtyDermatology

Signs and symptoms

Striae, or "stretch marks", begin as reddish or purple lesions, which can appear anywhere on the body, but are most likely to appear in places where larger amounts of fat are stored; the most common places are the abdomen (especially near the navel), breasts, upper arms, underarms, back, thighs (both inner and outer), hips, and buttocks. Over time, they tend to atrophy and lose pigmentation. The affected areas appear empty, and are soft to the touch.[5]

Stretch marks occur in the dermis, the resilient middle tissue layer that helps the skin retain its shape. No stretch marks will form as long as there is support within the dermis; stretching plays a role in where the marks occur and in what direction they run, however, there are a number of contributing factors (see: "Causes", below) to their formation.

They can (but do not always) cause a burning and itching sensation, as well as emotional distress. They pose no health risk in and of themselves, and do not compromise the body's ability to function normally and repair itself, however, they are often considered a cosmetic nuisance.[6] Young women are generally affected the most and often seek treatment for them from a dermatologist[7] and following pregnancy.[8]

  • Striae gravidarum in a pregnant woman at 38 weeks.
  • Stretch marks from pregnancy >1 year postpartum.
  • Normal stretch marks in a teenage male
  • Stretch marks in a female breast
  • Striae distensae on an obese male

Causes

Stretch marks appear to be caused by stretching of the skin. This is especially true when there is an increase in cortisone[9] - an increase in cortisone levels can increase the probability or severity of stretch marks by reducing the skin's pliability. More specifically, it affects the dermis by preventing the fibroblasts from forming collagen and elastin fibers necessary to keep rapidly growing skin taut; this can create a lack of supportive material as the skin is stretched, and lead to dermal and epidermal tearing, which in turn can produce scarring in the form of stretch marks. This is particularly the case when there is new tissue growth (which can interfere with the underlying physical support of the dermis or epidermis, by displacing the supportive tissue).

Examples of cases where stretch marks are common, also given by the Mayo Clinic, include weight gain (in the form of fat and/or muscle), pregnancy, and adolescent growth spurts, though it is also noted that some medications, as well as other medical conditions and diseases, may increase the likelihood of stretch marks appearing. In the case of medication, the Clinic points to "Corticosteroid creams, lotions and pills and chronic use of oral or systemic steroids" as a common contributing factor. Medical conditions that can contribute to stretch marks include Ehlers-Danlos syndrome, Cushing's syndrome, Marfan syndrome, and "adrenal gland diseases".

Pregnancy

Pregnancy stretch marks, also known as striae gravidarum, are a specific form of scarring of the skin of the abdominal area due to rapid expansion of the uterus as well as sudden weight gain during pregnancy. About 90% of women are affected.[10]

A number of additional factors appear to promote the appearance of stretchmarks: one study of 324 women, done just after they had given birth, demonstrated that low maternal age, high body mass index, weight gain over 15 kg (33 pounds) and higher neonatal birth weight were independently correlated with the occurrence of striae. Teenagers were found to be at the highest risk of developing severe striae.[11]

These skin marks are symptoms of pregnancy caused by the tearing of the dermis, resulting in atrophy and loss of rete ridges.[12] These scars often appear as reddish or bluish streaks on the abdomen, and can also appear on the breasts and thighs. Some of these striae disappear with time, while others remain as permanent discolorations of the body.[6]

Mechanical distension and rapidly developing areas of the body during pregnancy (such as the abdomen, 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 mucopolysaccharides, which increases water absorption of connective tissue, making it prime for tearing under mechanical stress.[7][11] There also seems to be an association between higher body mass indices and in women with bigger babies and the incidence and severity of striae. Also, younger women seem to be at higher risk of developing striae during pregnancy.[7][13]

The prevalence and severity of striae gravidarum varies among populations. The current literature suggest that in the general population of the US, there is a 50%-90% prevalence of striae associated with pregnancy,[13] partly as a result of the normal hormonal changes of pregnancy and partly due to stretching of skin fibers.[3][14] Many women experience striae gravidarum during their first pregnancy. Nearly 45% percent of women develop striae gravidarum before 24 weeks of gestation.[6] Many women who develop lesions during the first pregnancy do not develop them during later pregnancies. Genetic factors such as genealogy and race also seem to be predictive in the appearance of striae.[15]

Prevention

A systematic review has not found evidence that creams and oils are useful for preventing or reducing stretch marks in pregnancy.[3] The safety in pregnancy of one ingredient, Centella asiatica, has been questioned.[14] Evidence on treatments for reducing the appearance of the scars after pregnancy is limited.[14]

Treatment

There are no clearly useful treatments for stretch marks, although there are many different suggestions on how to remove them or lessen their appearance.[4]

Various efforts that have been tried including laser treatments, glycolic acid, and microdermabrasion.[16] Tretinoin (0.1% w/w), which is a retinoid, has found to be effective on early stretch marks in several studies. Hyaluronic acid also improves the appearance of stretch marks.[17][18] Topical tretinoin is categorized by the FDA as a known teratogen (causing malformations in fetuses) in animals, without adequate human studies on safety in pregnancy.[19]

Carboxytherapy is a known procedure; however, there is a lack of evidence to support how effective it is.[20]

History

Since ancient times, pregnant women have sought remedies to prevent stretch marks during pregnancy. Both ancient Greeks and Romans used olive oil, while Ethiopians and Somalis used frankincense.[21]

Striae was first recognized by Roederer in 1773, and was later histologically described by Troisier and Ménétrier in 1889.[22] In 1936, Nardelli made the first morphologically correct descriptions.[23]

Terminology

Medical terminology for these kinds of markings includes striae atrophicae, vergetures, stria distensae, striae cutis distensae, lineae atrophicae, linea albicante, or simply striae.

gollark: It's false color, bee.
gollark: yes it is.
gollark: https://tenor.com/view/nasa-solar-flare-sun-flare-solar-gif-9361902
gollark: Thus, <:bees:724389994663247974> you apiaristic forms deployed!!!
gollark: But there's a solutionish for that which you just said was bad.

References
  1. Christoph Zink (15 June 2011). Dictionary of Obstetrics and Gynecology. Walter de Gruyter. p. 230. ISBN 978-3-11-085727-6.
  2. "Are Pregnancy Stretch Marks Different?". American Pregnancy Association. 19 January 2013. Archived from the original on 19 January 2013.
  3. Brennan, M; Young, G; Devane, D (14 November 2012). "Topical preparations for preventing stretch marks in pregnancy". The Cochrane Database of Systematic Reviews. 11: CD000066. doi:10.1002/14651858.CD000066.pub2. PMID 23152199.
  4. Liu, L; Ma, H; Li, Y (August 2014). "Interventions for the treatment of stretch marks: a systematic review". Cutis. 94 (2): 66–72. PMID 25184641.
  5. "Stretch Mark". Encyclopædia Britannica. Retrieved 1 November 2009.
  6. "Stretch Mark". Retrieved 10 November 2011.
  7. Chang, AL; Agredano, YZ; Kimball, AB (2004). "Risk factors associated with striae gravidarum". J Am Acad Dermatol. 51 (6): 881–5. doi:10.1016/j.jaad.2004.05.030. PMID 15583577.
  8. James, William D.; Berger, Timothy G.; et al. (2006). Andrews' Diseases of the Skin: clinical Dermatology. Saunders Elsevier. ISBN 978-0-7216-2921-6.
  9. "Stretch marks - Symptoms and causes". mayoclinic.org. Retrieved 4 April 2018.
  10. Korgavkar, K; Wang, F (March 2015). "Stretch marks during pregnancy: a review of topical prevention" (PDF). The British Journal of Dermatology. 172 (3): 606–15. doi:10.1111/bjd.13426. PMID 25255817.
  11. Atwal, G.S.S.; Manku, L.K.; Griffiths, C.E.M.; Polson, D.W. (2006). "Striae gravidarum in primiparae". British Journal of Dermatology. 155 (5): 965–9. doi:10.1111/j.1365-2133.2006.07427.x. PMID 17034526.
  12. Kroumpouzos, G; Cohen, LM (2003). "Specific dermatoses of pregnancy: an evidenced-based systematic review". Am J Obstet Gynecol. 188 (4): 1083–92. doi:10.1067/mob.2003.129. PMID 12712115.
  13. Thomas, RGR; Liston, WA (2004). "Clinical associations of striae gravidarum". Journal of Obstetrics and Gynaecology. 24 (3): 270–27. doi:10.1080/014436104101001660779. PMID 15203623.
  14. Tunzi, M; Gray, GR (15 January 2007). "Common skin conditions during pregnancy". American Family Physician. 75 (2): 211–8. PMID 17263216.
  15. Tunzi M, Gray GR (January 2007). "Common skin conditions during pregnancy". Am Fam Physician. 75 (2): 211–8. PMID 17263216.
  16. Al-Himdani, S; Ud-Din, S; Gilmore, S; Bayat, A (March 2014). "Striae distensae: a comprehensive review and evidence-based evaluation of prophylaxis and treatment". The British Journal of Dermatology. 170 (3): 527–47. doi:10.1111/bjd.12681. PMID 24125059.
  17. Mysore, Venkataram; Lokhande, ArchanaJ (2019). "Striae distensae treatment review and update". Indian Dermatology Online Journal. 10 (4): 381–82. doi:10.4103/idoj.IDOJ_336_18. ISSN 2229-5178.
  18. "Stretch marks: Why they appear and how to get rid of them". American Academy of Dermatology. 11 November 2019. Retrieved 16 June 2020.
  19. "Renova (tretinoin) cream". DailyMed. FDA and National Library of Medicine.
  20. "Carboxytherapy And Mesotherapy Unproven" (Press release). 2009.
  21. "Botany". Retrieved 10 November 2009.
  22. Almeida, Guilherme; Marques, Elaine; Golovaty, Rachel (2017). "CO2 Laser for Stretch Marks". Clinical Approaches and Procedures in Cosmetic Dermatology. Cham: Springer International Publishing. p. 1. doi:10.1007/978-3-319-20251-8_12-1. ISBN 978-3-319-20250-1. ISSN 2511-820X.
  23. Elsaie, Mohamed L.; Baumann, Leslie S.; Elsaaiee, Lotfy T. (2009). "Striae Distensae (Stretch Marks) and Different Modalities of Therapy". Dermatologic Surgery. Ovid Technologies (Wolters Kluwer Health). 35 (4): 563. doi:10.1111/j.1524-4725.2009.01094.x. ISSN 1076-0512.
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