I don't know to be honest. I only did a couple. And as they are under the area which flakes up it's difficult to see whether they came back or not. These dots are only in the affected areas of my lip. If you are going to do it be very careful because I wouldn't want your lips to look worse. I read how someone did it here:
Probably start by maybe doing one or two and see how it goes. I definately got two out from the centre of my top lip though. Did it after showering and peeling the plaques off so you could see the spots clearly. Little prick with a pin (And I mean little. I didn't go very deep at all. Just enought to break the skin slightly was enough. Don't go ramming the needle deep into your lip!) and a relatively hard squeeze.
There was little swelling and the two tiny red marks where the spots had come through healed in a couple of days.