I had a mole removed 8 months ago for a biopsy but the scar is still very bad and painful. Could this be a symptom if something?

I had this mole from when I was very little and it has been growing. At 15, it was removed (6 stiches + 12 internal) and sent to be tested. Nothing was found, which is good. However, my scar was very swollen and painful for a long time, which I just thought was going to heal. About 2-3 months later I had an infection there (precisely, an ulcer) which healed but not the scar. Despite having had steroid injections on the scar couple of months ago, after 8 months my scar is very swollen and painful

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