Hi, I hope you don't mind me jumping in here. I'm an electrologist and I have Google set up to send me anything new on the web with "electrologist" in it. So it sent me a link, and here I am.
There are several possibilities why you are having this swelling. If your electrologist is using a stainless steel needle, you may be allergic to the nickel in it. Ask her to try a gold needle.
How much time was spent on the upper lip? More than 30 minutes in a 7 day span is over treating the skin.
What does she apply or do for after treatment? Ask for ice or a cold compress. If she doesn't have that available, take a small ice pack with you. Even freezing a bottle of water and holding it against the skin as you drive will work.
The contusion is from either getting very close to or actually piercing a capillary. I don't think I've ever done this on the upper lip, but that's not to say it's not a possibility. This happens on the brows more easily... ever noticed all those capillaries under the brow bone? That's why black eyes from an impact to the area happen more than the same impact on another area. Icing immediately can help with that as well.
Be sure to express these concerns to your electrologist. She needs the feedback in order to at least try to make adjustments you can live with. And then there are a few that no matter what we try, their skin is just too sensitive. Which reminds me, are you taking any medication that is photosensitive?