Had a skin cancer biopsy. told it was basal, had mohs surgery, but doctor found no cancer! lab was wrong, or failed to note it was all removed, no?

BCC: This is a common occurrence. But better to side on removal to be safe. Under excised BCCs grow like an iceberg. So instead of blaming be happy your docs took the time just to be sure...

Not uncommon: When a suspicious mole is removed, many times it removes all the cancer. On pathology, they may not see clear or negative margins, so they report that the edges are not clear. That means it needs to be re-excised to be sure the margins are clear. Many time on re-excision, there is no further evidence of cancer. Now you know the margins of excision are clear and therefore less likely for recurrence