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Wrinkles which appear on the forehead are expression wrinkles (link to expression wrinkles). They occur between the eyebrows and horizontally below the hairline.
Caused by muscles
The eyebrows can stay in position thank to two opposing forces:
- the lowering muscles situated around the eyebrows
- the lifting muscles of the forehead
Creases form on the forehead which the lifting muscles are used. The forehead of a young face becomes smooth again as soon as the muscles relax. As time passes, the skin becomes less elastic and the lifting muscles shorten: the forehead creases become permanent. Forehead wrinkles are formed.