How frown lines form
These lines develop from repeated contraction of the muscles that pull the brows together. With repetition, the skin folds in that spot, and over time the line becomes visible even when the muscles are not contracting.
Initially the line appears only while the muscles are contracted. With time, it can appear when the muscles are relaxed as well.
These movements commonly engage the muscles involved:
- Frowning
- Concentrating
- Squinting
- Becoming emotionally engaged
- Expressing yourself freely with facial movement






