Upload & Sell: Off
Thanks all for taking the time to write!
I wrote back that we'd just be creative with angles and framing, and suggested she get a lipstick that would even out any discoloration. I also cautioned her that if Photoshop work was needed beyond what I normally do, then we'd look into outsourcing to a professional retoucher...but as long as she wasn't expecting close-up shots of the lower half of her face in every photo, then it should be fine.
As far as rescheduling, I also said that since we've had this weekend booked for a while, let's just roll with it and have fun. In the back of my mind, I was prepared to offer a reshoot if things turned out poorly. To be honest, I secretly wanted to do the shoot as I thought it would be a good opportunity to force myself to try different things (not that I wish cold sores on anybody, especially when they have a photoshoot -- but when presented with lemons, make lemonade, right?)
In the end, everything worked out well! They were such a pleasure to shoot. I'll do some spot healing, which was expected, but I don't think we'll need any significant rework.
This all reminds me of when my husband and I had our own shoot last year -- we both had severe sunburns on our faces that were at the red and peeling stage! (This is what happens when you let winter-weary Canadians loose in California with a convertible, eh!)
Thanks again for your advice!