Stretch marks look like lines or streaks across the skin. Stretch marks are very common. They're harmless and often get less visible over time.

Stretch marks are often caused by sudden growth or weight gain. You may be more likely to get them if you

• are pregnant
• are going through puberty
• lose or gain weight quickly
• are female
• are overweight
• use some kinds of steroid creams or tablets
• have a family member with stretch marks

Stretch marks usually fade over time but may not disappear completely. Many creams and lotions claim to prevent, reduce or remove stretch marks. But there's very little evidence these work.