Phillips lumea prestige does not flash on the middle of the upper lip. It usually gives a white "okay" light for it to work when it's in contact with skin. It works on the two sides of my upper lip but does not "activate" in the middle of the upper lip. I've tried stretching my upper lip over my teeth, etc. and nothing is helping it sense it..! Any tips?
I am using the face filter attachment provided by the way.