Stretch marks, or striae, are long, narrow streaks or lines that develop on the skin when it is stretched rapidly due to growth spurts, pregnancy, weight gain, or hormonal changes. Initially red, purple, or pink, these marks often fade over time to silvery-white. While not harmful, they can affect self-confidence and skin appearance.

Stretch marks vary in color, depth, and age. Common types include:

Striae Rubrae – Fresh marks that appear red or purple due to inflammation.

Striae Albae – Mature marks that appear white, silver, or skin-colored.

Striae Distensae – Deep, wide stretch marks often seen in bodybuilders.

Striae Atrophicans – Occur due to long-term corticosteroid therapy or Cushing's syndrome.

Stretch marks can affect anyone, but they are more common in pregnant women, adolescents undergoing growth spurts, athletes or bodybuilders, individuals with obesity, or those on long-term steroids. Genetics also plays a role.