Stretch marks

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"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.
Stretch marks
Belly Strech Marks.jpg
Classification and external resources
Specialty Dermatology
ICD-10 L90.6
ICD-9-CM 701.3
DiseasesDB 30027
MedlinePlus 003287
eMedicine derm/406
Stretch marks in a female breast
Striae distensae on an obese white male
Striae gravidarum in a white female two weeks before delivery of a healthy infant

Stretch marks or striae (singular stria) or striae distensae, as they are called in dermatology, are a form of scarring on the skin with an off-color hue. They are caused by tearing of the dermis, which over time may diminish, but will not disappear completely.

Stretch marks are often the result of the rapid stretching of the skin associated with rapid growth or rapid weight changes. Stretch marks in most cases may also be influenced by hormonal changes associated with puberty, pregnancy, bodybuilding, hormone replacement therapy, etc.[1] Medical terminology for these kinds of markings includes striae atrophicae, vergetures, stria distensae, striae cutis distensae, lineae atrophicae, linea albicante, or simply striae. Stretch marks formed during pregnancy, usually during the last trimester, and usually on the belly, but also commonly occurring on the breasts, thighs, hips, lower back and buttocks, are known as striae gravidarum.[2]

Signs and symptoms[edit]

They first appear as reddish or purple lines, but tend to gradually fade to a lighter range. The affected areas appear empty and are soft to the touch.[3] Stretch marks occur in the dermis, the resilient middle layer that helps the skin retain its shape. No stretch marks will form as long as there is support within the dermis. Stretching plays more of a role in where the marks occur and in what direction they run. Stretching alone is not the cause.

Stretch marks can appear anywhere on the body, but are most likely to appear in places where larger amounts of fat are stored. Most common places are the abdomen (especially near the navel), breasts, upper arms, underarms, back, thighs (both inner and outer), hips, and buttocks. They pose no health risk in and of themselves, and do not compromise the body's ability to function normally and repair itself.[4]

Striae gravidarum[edit]

Striae gravidarum or pregnancy stretch marks, is a form of scarring of the skin of the abdominal due to sudden weight gain during pregnancy. These off-color blemishes are symptoms of pregnancy caused by the tearing of the dermis, resulting in atrophy and loss of rete ridges.[5] These scars often appear as reddish or bluish streaks on the abdomen, and can also appear on the breasts and thighs. Some striae disappear with time, while others remain as permanent discolorations of the body.[6]

Striae begin as reddish purple lesions, and, over time, lose pigmentation and atrophy. They can cause a burning and itching sensation, as well as emotional distress. They are rarely harmful, but thought of more as a cosmetic nuisance.[6] Young women are generally affected the most and usually seek treatment for lesions from a dermatologist[7] and following pregnancy.[8]

Mechanical distention 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 muocopolysaccharides, which increases water absorption of connective tissue, making it prime for cleavage under mechanical stress.[7][9] 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][10]

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,[10] partly as a result of the normal hormonal changes of pregnancy and partly due to stretching of skin fibers.[11][12] Many women experience striae gravidarum during their first pregnancy. Nearly 45% percent of women develop striae gravidarum before 24 weeks of gestation.[6] Interestingly, many women who develop lesions during the first pregnancy do not develop them during later pregnancies. Genetic factors such as family history and race also seem to be predictive in the appearance of striae.[13]

Cause[edit]

A number of other factors promote the appearance of stretchmarks: one study of 324 women just after giving birth demonstrated that low maternal age, high body mass index, weight gain over 15 kg (33 pounds) and higher neonatal birth weight were independently associated with the occurrence of striae. Teenagers are at highest risk of developing severe striae.[14]

The glucocorticoid hormones responsible for the development of stretch marks affect the dermis by preventing the fibroblasts from forming collagen and elastin fibers, necessary to keep rapidly growing skin taut. This creates a lack of supportive material, as the skin is stretched and leads to dermal and epidermal tearing.

Prevention[edit]

A systematic review has not found evidence that the creams and oils that have been studied for preventing or reducing stretch marks in pregnancy are effective.[11] The safety in pregnancy of one ingredient, Centella asiatica, has been questioned.[12] Evidence on treatments for reducing the appearance of the scars after pregnancy is limited.[12]

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 Somalians used frankincense.[15] Both of these treatments have surged in their use in recent years. Results of modern studies have offered conflicting results regarding the efficacy of various topical ointments. Conventional treatment includes topical 0.1% tretinoin (all-trans-retinoic acid) cream mixed with various lotions and moisturizers. Some unconventional prevention therapies include applying castor oil, taking thiosinaminum, applying seaweed wraps, using topical glycolic or fruit acids, and various other homeopathic creams and/or oils.[16] To date, nothing appears to definitively prevent striae gravidarum from forming.[10]

Treatment[edit]

Various treatments are available for the purpose of improving the appearance of existing stretch marks, including laser treatments, dermabrasion, and prescription retinoids.[citation needed] Topical tretinoin (prescription retinoid) is categorized by the FDA as a known teratogen (causing malformations in fetuses) in animals, without adequate human studies on safety in pregnancy.[17] Some cream manufacturers claim the best results are achieved on recent stretch marks; however, few studies exist to support these claims.

Some success has been made in treating and eliminating striae gravidarum. Some studies have examined the use of 20% glycolic acid and 10% L-ascorbic acid with zinc sulfate and tyrosine, as well as laser treatments in reducing the appearance of striae.[16][18]

A surgical procedure for removing lower abdominal stretch marks is the tummy tuck, which removes the skin below the navel where stretch marks frequently occur.

A new modality, fractional laser resurfacing, offers a novel approach to treating striae.[19] Using scattered pulses of light only a fraction of the scar is zapped by the laser over the course of several treatments. This creates microscopic wounds. The body responds to each treatment by producing new collagen and epithelium. In a 2007 clinical trial, 5-6 treatments resulted in striae improving by as much as 75 percent.[20] A 2007 Brazilian clinical study showed that fractional laser resurfacing improved both texture and appearance of mature, white striae in skin types I-IV.[21]

References[edit]

  1. ^ Bernstein, Eric. What Causes Stretch Marks?. 15 December 2008. The Patient's Guide to Stretch Marks. 10 Feb 2009
  2. ^ "Are Pregnancy Stretch Marks Different?". American Pregnancy Association. 
  3. ^ "Stretch Mark". Encyclopædia Britannica. Retrieved 1 November 2009. 
  4. ^ "How to prevent and treat stretch marks". iVillage. Retrieved 1 November 2009. 
  5. ^ Kroumpouzos, G; Cohen, LM (2003). "Specific dermatoses of pregnancy: an evidenced-based systematic review". Am J Obstet Gynecol 188: 1083–92. 
  6. ^ a b c "Stretch Mark". Retrieved 2011-11-10. 
  7. ^ a b c Chang, AL; Agredano, YZ; Kimball, AB (2004). "Risk factors associated with striae gravidarum". J Am Acad Dermatol 51: 881–5. doi:10.1016/j.jaad.2004.05.030. 
  8. ^ James, William D.; Berger, Timothy G. et al. (2006). Andrews' Diseases of the Skin: clinical Dermatology. Saunders Elsevier. ISBN 0-7216-2921-0. 
  9. ^ 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. 
  10. ^ a b c Thomas, RGR; Liston, WA (2004). "Clinical associations of striae gravidarum". Journal of Obstetrics and Gynaecology 24 (3): 270–27. doi:10.1080/014436104101001660779. 
  11. ^ a b 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. 
  12. ^ a b c Tunzi, M; Gray, GR (15 January 2007). "Common skin conditions during pregnancy". American family physician 75 (2): 211–8. PMID 17263216. 
  13. ^ Tunzi M, Gray GR (January 2007). "Common skin conditions during pregnancy". Am Fam Physician 75 (2): 211–8. PMID 17263216. 
  14. ^ 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. 
  15. ^ "Botany". Retrieved 2009-11-10. 
  16. ^ a b Ash, K; Lord, J; Zukowski, M (1998). "Comparison of topical therapy for striae alba (20% glycolic acid/0.05% tretinoin versus 20% glycolic acid/10% l-ascorbic acid)". Dermatol Surg 24: 849–56. doi:10.1111/j.1524-4725.1998.tb04262.x. 
  17. ^ "Renova (tretinoin) cream". DailyMed. FDA and National Library of Medicine. 
  18. ^ name="Bolognia">Rapini, Ronald P.; Bolognia, Jean L.; Jorizzo, Joseph L. (2007). Dermatology: 2-Volume Set. St. Louis: Mosby. ISBN 1-4160-2999-0. 
  19. ^ Stoland, Mira; Chapas, Anne M.; Brightman, Lori; Sukal, Sean; Hale, Elizabeth; Karen, Julie; Bernstein, Leonard; Geronemus, Roy G. (September 2008). "The Safety and Efficacy of Fractional Photothermolysis for Correction of Striae Distensae".". The Journal of Drugs in Dermatology 7 (9): 857–861. Retrieved October 30, 2014. 
  20. ^ Petrou I (February 2007). "Fractional photothermolysis tackles striae distensae". Dermatology Times 28 (2): 94–106. Retrieved 23 May 2007. 
  21. ^ "Fractional photothermolysis for the treatment of striae distensae". Journal of the American Academy of Dermatology 56 (2, Supplement 2): AB204–AB204. 2007. doi:10.1016/j.jaad.2006.10.931.