Hello, when a biopsy is performed pathology can inform the doctor of the type of lesion and give information regarding the margins (whether a rim of adequate normal tissue was removed around the lesion). Different lesions need different amounts of margin to help ensure their removal. Cancerous lesions need the most, while lesions with atypia require adequate margins but usually need less. If your biopsy site has dark edges, it may be part of the healing process, but could be residual mole at the skin edges. If the pathology showed some atypia I would recommend showing this to your doctor and to ensure you do not need additional margins taken via a re-excision. Leaving residual cells from this mole can increase your risk for recurrence or progression of the atypia to a more serious lesion.
