Movement lines or skin creases? The test that decides
This single distinction explains almost every disappointed patient.
Movement lines, or dynamic lines. Appear when a muscle contracts and disappear when it relaxes. Frown lines between the brows when you scowl, horizontal forehead lines when you raise your brows, crow's feet at the outer eye when you smile. These are what botulinum toxin treats, and it treats them well.
Skin creases, or static lines. Visible with your face completely still, because the skin itself has been folded so many times that it has creased permanently, and because collagen and elastin have thinned. Relaxing the muscle beneath softens them a little over months by stopping further folding, and it does not erase them.
The test, and do it before you book. Sit in front of a mirror in good light. Let your face go completely slack: do not frown, do not raise your brows, do not smile. Look at your forehead, between your brows and at your outer eyes. Whatever you can still see is a skin crease.
What to do about creases. Resurfacing, either laser or a chemical peel, remodels the skin itself, and the laser skin resurfacing and chemical peel pages cover it. Fine filler placed superficially can soften a deep static frown line. Skin quality treatments and time help. Botulinum toxin alongside any of those prevents the line being refolded, so it is a sensible adjunct rather than the answer.
The mixed picture, which is most people over forty. Some movement component and some crease. Botulinum toxin gives a partial result, which is worth having, and a patient who expects complete erasure is disappointed by a treatment that actually worked.
What a good practitioner does. Assesses your face at rest and in animation separately, tells you which of your lines are movement and which are crease, and predicts the partial result honestly rather than implying they will all go.
The areas it treats reliably. Frown lines between the brows, horizontal forehead lines, and crow's feet. These three are the well-established indications and where the evidence and the experience are strongest.
Other uses, briefly. Bunny lines on the nose, a downturned mouth, a dimpled chin, a gummy smile, neck bands, jaw slimming by treating the masseter muscle, and excessive sweating of the armpits or palms, which is a genuinely useful medical application. Each needs specific expertise, and the jaw and neck uses in particular are more technically demanding than the upper face.
Ask, in these words: which of my lines are movement lines and which are creases, and what will each look like afterwards?
