Detailed answer

Stretch marks, also known as striae, can develop on various parts of the body, including the upper arms. Stretch marks occur when the skin is stretched due to rapid growth or weight gain, causing the collagen and elastin fibers to tear. This leads to the formation of visible lines or streaks on the skin. Factors like genetics, hormonal changes, pregnancy, and sudden weight fluctuations can contribute to the development of stretch marks. While commonly found on the abdomen, breasts, thighs, and buttocks, stretch marks can certainly appear on the upper arms as well. Treatment options such as topical creams, laser therapy, and microneedling can help reduce the appearance of stretch marks.