A wrinkle in the skin is typically formed perpendicular to a contracting muscle located directly beneath it. For example, the muscle in the forehead is a vertical muscle, and when it contracts (such as when you raise your eyebrows), the lines that form (wrinkles) will be horizontal.
Likewise, the two muscles that are responsible for the frown lines are positioned slightly horizontally between the eyebrows, so when they contract, the frown lines appear vertical.
Botox is injected into muscles, where it blocks nerve impulses to those tissues. The muscle activity that causes the frown lines is reduced, and a smoother look results. Without a contracting muscle beneath it, the skin has a difficult time wrinkling.
Botox is priced per area and there are usually 3 area's in total:
AREA 1 - Frontalis Muscle which treats the horizontal frown lines on the forehead.
AREA 2 - Glabella which treats the vertical lines in the eyebrows.
AREA 3 - Orbicularis oculi muscles which treat the crows feet surrounding the eyes.
As with any procedure, there can be side effects but the most commonly reported from Anti-Wrinkle Injections are headaches and migraines. These generally subside once the full effects of the treatment have taken place. Other potential side effects include pain at the injection site, infection, inflammation, swelling, redness, bleeding and bruising. Some of these symptoms may indicate an allergic reaction; other allergy symptoms are itching, wheezing, asthma, a rash, red welts, dizziness and faintness. Tell your practitioner immediately if you have any breathing issues or a faint or dizzy feeling.