If it's an accident, you have the duty to tell the patient. "Hey, ma'am, sorry to say, but I fucked up big time and I stitched up your vagina a bit too far. I'm terribly sorry, I can either fix it right now or, if any complications arise, please come see me again and we'll have it fixed." No issue. Mistakes happen.
But if a doctor is doing something like that and doesn't tell you - even if it's an error - he's to be held fucking liable.