Detailed answer

Stretch marks are caused by the rapid stretching of the skin. While gaining muscle can lead to some increase in muscle mass and size, it does not typically cause the same level of rapid skin expansion that leads to stretch marks. However, it's worth noting that individuals who experience significant weight gain alongside muscle development may be more prone to developing stretch marks as the skin stretches to accommodate the increased weight. Additionally, certain genetic factors, hormonal changes, or medical conditions can also contribute to the development of stretch marks. To minimize the risk of stretch marks during muscle gain, it is important to maintain a gradual, steady increase in muscle mass, stay hydrated, and moisturize the skin regularly.