Why is my glabella (Dysport treated) having involuntary muscle movement and unevenly swelling up when pressure is applied?

About 2 months ago, I got Dysport in 11’s, forehead, & eyebrow area w/great result. Recently washed face & applied pressure to glabella & eyebrow area. Suddenly, these areas got unevenly swollen. Glabella involuntarily contracted making 11’s & froze like that for few secs. Now when pressure is applied to glabella, no involuntary contraction of 11’s occurs, but glabella still has slight involuntary muscle sensation, bumpy/uneven swelling, & redness for few secs. This stops quickly. What is cause?