While there are specialized scar creams for the face, 20 years is too long for a cream to remove it. However, there are options to minimize the scar so that it is less noticeable to the naked eye. Scars are noticeable for a few reasons: 1) color difference 2) texture and 3) unevenness (e.g. raised/depression) when compared to the adjacent skin. Please consult with a board certified specialist in the face who can best help you achieve the results you desire.