Stretch marks are cosmetic changes to the skin surface due to rupture of elastic fibers in the dermis that affect the epidermis, with a solution of continuity, giving a healing aspect variable with the type of streaks and their degree of evolution. Result from the disruption of elastic fibers due to excessive traction of the skin site. 

The causes of stretch marks are mechanical (rapid growth, exercise load or competition and other factors that lead to excessive stretching of the skin), obesity or successive regimes (pregnancy, "accordion effect", etc..), Endocrine / hormonal (and other steroids). They can occur in men and women (75%). 

In women lie mostly on the side of the thighs, outer thighs, breasts, buttocks, abdomen and flanks. Men are more frequent in the shoulder, abdomen and buttocks. 

Types by staining 
Rosy: Newest, flat or wavy, generally good response to treatment with improvement. 
Pearly or atrophic, lighter, and thinner skin, difficult to reverse with treatment. 

Treatments available for stretch marks 
- Mechanical exfoliation (micro stimulation, chemical peels, crystal, diamond, etc..) 
- Chemical exfoliation with acids, 
- Dermal stimulation with acids (intradermoterapia, mesotherapy) 
- Micro current, 
- Galvanic, 
- Laser 
- Ionoforese, among others.