20 Units of Dysport in Forehead HATE IT When Will It Go Away?

Typically, Dysport will last 3-4 months.  I would recommend that you follow-up with your provider who injected you.

Twenty units for the frontalis muscle (forehead) is the dosing for botox, not dysport. I usually use about 50 units of dysport or 20 units of botox on the forehead. Every face is different, and I have seen some variation in how much effect a patient experiences from a typical injection of either product. Some patients request less, and I always respect this wish. Your results shouldn't last more than about 4 months.

20 units of Dysport is a very small dose for the forehead.  Normally, I would use at least 50 units for that area.  If you just had a small portion of your forehead treated, then it is possible that 20 units could be used.  The effect from Dysport normally will last three to six months.  You mentioned you were treated on January 17th.  If that is correct, that is essentially a year ago and you should not have any effect from the Dysport at this point.  If you were just treated recently, I would recommend returning to your injecting physician, as there may be some fine tuning that could be done to improve your appearance.