Lumpiness of the forehead can come when a person is very angry or surprised or using their forehead muscles most of the time. So botox is an injection give into the muscle which relaxes the muscle. So if you take an injection of botox the relaxation of the muscles last for 4 to 6 months. So this smoothes out the lumps on the forehead. This can be repeated once the effect of the Botox wears off.

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