Stretch Marks Home A-Z Health Information Health Library A-Z Stretch Marks Overview Stretch marks, or striae, are long, narrow streaks or lines that develop due to rapid stretching of the skin. Types Striae rubrae: New, red, or purple stretch marks.Striae albae: Old, white, or silver stretch marks. Symptoms Indented streaks on the abdomen, breasts, hips, buttocks, or other areas. Causes PregnancyRapid weight gain or lossGrowth spurtsCorticosteroid use Diagnosis Physical examination by a dermatologist. Treatment Topical treatments (retinoids)Laser therapy (Harmony XL Pro)Microneedling, or PRP therapy as deemed suitable.