DMSO can drive things into the skin and that can be very helpful if combined with the correct ingredients.
Tests have shown that Iodine can be helpful as can vitamin C plus the amino acids that are used to form collagen, from memory Glycine, Proline plus a couple others which I cannot recollect, see the wikipedia collagen entry.
Nattokinase enzyme, serrapeptase coupled with DMSO should provide useful and combined with the necessary amino acids to form replacement skin/collagen should provide what is needed at the required location ie the place of the scar rather than being used elsewhere in the body if taken via the digestive system.
Use those enzymes carefully starting with small amounts to test for effect. Make sure that you clean the skin thoroughly and sterilize BEFORE using DMSO or it can drive bacteria into the skin which you do not want. DMSO can work very well but you do need to be careful. Do not apply it using a finger, use something sterile.