I have old wounds (10 years) both on my side foot, diameter 4cm, , I don't have diabetes, and the wound can't healing, . Please help, ?

See a doctor. You need to have this evaluated to find out why it is not healing and then get it healed.
Biopsy. It's hard to say without a picture or a history, but if you have had wounds for that long, and there is nothing in your history or activity that wound elegantly explain why they are there, i would suggest a biopsy of the wounds. That's a long time for wounds to be present, make sure you are seeing the appropriate specialist who can ascertain the diagnosis and formulate treatment.