Thanks Doorstop.
I think it was the larger dilator that did it. It felt quite painful last week, but became a lot easier at the weekend. Trouble is, there's so much discomfort and nerves pinging and twanging that a stitch coming loose isn't going to notice.
I've had a look with a hand mirror and it looks most plausible. I'd complained to the surgeon's PA and she said to use more lubricant. I wasn't convinced but went ahead anyway.
I'm feeling annoyed with myself for not trusting my own judgement. It rarely lets me down.
That larger dilator... If a lad pulled something that size out of his pants, I'd run a mile.
I know what a decent size willy looks like and this is taking the rip.