3 years post-op- Persistent swelling and redness after cyst and lipoma removal a few years back. What could this be?

I had a pilonidal cyst back in 2018, that first showed 2 weeks before my period. It progressed so quickly, the next week i had to have it drained. After a month of dressing the wound it healed. A year and some change later, i returned to the doctor’s because the site would swell and become painful to the point that I’d have to lay on my stomach. The determined that a lipoma had formed and removed it. within 2 weeks the scar healed. Now in 2022, it is extremely swollen and red. What can this be?