What Caused my Stretch Marks?
I am a female in early 20s, no kids. I have stretch marks on my upper arms, lower back, hips, back of my calves and knees. I lost 20% body weight and had a six point drop in my BMI when I was in high school, over about 2-3 months. My dermatologist said I lost significant weight too fast, and this likely caused my stretch marks. He said teens are more vulnerable to stretch marks, and they may be related to hormones. He says they are permanent. Is this true?