Linear scars or stretch-like marks on both sides of the chest near the arms are often stretch marks, which can develop due to rapid growth, weight changes, muscle gain, hormonal changes, pregnancy, or stretching of the skin over time. These marks are usually harmless and commonly appear as reddish, pink, purple, or lighter lines on the skin. Although they may not disappear completely, their appearance can often improve gradually with proper skin care and treatment. Regular use of moisturisers, cocoa butter, coconut oil, almond oil, or creams containing vitamin E, hyaluronic acid, or mild retinoids may help improve skin texture and make the marks less noticeable. Retinoid creams should only be used under medical guidance and avoided during pregnancy. Maintaining a stable weight, drinking enough water, eating a healthy diet rich in protein and vitamins, and exercising regularly may also support skin health. If the marks are deep or longstanding, treatments such as laser therapy, microneedling, chemical peels, or radiofrequency treatment performed by a dermatologist may provide better improvement. If the marks are increasing rapidly or associated with other symptoms such as weight gain, weakness, or hormonal problems, it is best to consult a dermatologist for proper evaluation.