It is quite common for chest scars to develop into keloids, and there are several gentle, effective ways to manage them. For at-home care, applying silicone gel or using silicone gel sheets daily can significantly help flatten and soften the scar. Regular, gentle massage also helps. If you do not see improvement, a dermatologist can provide highly effective options, such as triamcinolone (corticosteroid) injections to shrink the tissue, or prescribe topical retinoid creams. Please rest assured that keloids are completely harmless. I highly recommend consulting your doctor or dermatologist to choose the safest, most effective treatment plan for your skin.