Thanks for the query,
There is a possibility of infection in the scar.
There are instances of even development of soft tissue sarcoma
in the scars.
Please meet a dermatologist
for exact diagnosis.
If it is infection antibiotics would be enough.
may be required to confirm the diagnosis.
Let me know if you have any other doubt.
you can ask a direct question to me on this forum, following the below link.
Wishing you a good health.