Stretch marks in puberty, explained
Stretch marks are common in teenagers. The NHS lists puberty among the usual causes, because a fast growth spurt stretches the skin of the back, thighs, hips, bottom and breasts faster than the dermis can adapt. They are harmless, and they happen to boys as well as girls. Stretch Mark Removal London explains what to expect and why waiting is usually the right plan.
New marks are red, purple or darker than the skin around them, and they fade to paler lines over a year or two after growth slows. Treatment is rarely worth considering while growth is still under way, because new marks can keep forming and existing ones are still improving on their own. Keeping the skin moisturised can ease itching in the meantime. The guide to how stretch marks fade explains the timeline.