Bump on Chin Almost Immediately After Botox Injection? (photo)

From the picture you are showing, taken just hours after the Botox injection, this may represent an irregular appearance from the volume of liquid injected. Similarly, if a picture is taken just a few days after Botox injection, the appearance of the skin of the chin upon contraction of the muscles in the area may be quite irregular, as only part of the muscle fibers have relaxed, while others remain still active leading to puckering and irregularities of surface contour in some areas. You should be able to see the final smooth results at 10 to 14 days post injection. Consult your treating physician if the irregularities persist at that point. 

It would be helpful to see a picture prior to treatment and a picture at rest along with this picture of lip puckering.  As this ledge/bump form soon after the injection, it is possible that there is some bruising or swelling which should eventually subside.  I suggest you return to be evaluated by the injecting physician.  (This answer is not intended nor implied to be a substitute for medical advice. The information presented in this posting is for patients’ general education only.  Always seek the advice of your physician or other qualified healthcare provider for further evaluation of your individual case.)