Can a scar after mole removal hurt now and then?

A growth on my back, which was stinging occasionally, was diagnosed as a sebaceous wart and treated with cryo. It never disappeared completely, so I went back to the dermatologist. She removed it and sent it for analysis. When the results came in, she said "restless cells" were found, but the lesion was completely removed. This was several years ago. Quite regularly the scar still stings and I am worried the lesion was not fully removed. The dermatologist says it's nothing. What should I do?

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