Can the glabellar get worse after Dysport injection? I'm 1 month post op.

 From your picture, it appears that you have very deep lines in your glabella area. These lines maybe more than Botox or dysport can handle. When I see someone with such deep lines, I tell him that we will try a neurotoxin first. If after 3 to 4 weeks you still have a deep line you may require a filler. Fillers include Restylane or Juvederm. I would suggest you go back to your doctor and see what he or she says. 

Dysport works by relaxing the muscles and temporarily improve the look of fine lines and wrinkles. If there is still muscle movement after treatment, a higher dose of Dysport maybe needed.  Communicate with your provider about your concerns.  Best wishes, Dr. Aldo :-)

Thanks for your question, it looks like you may benefit from a touch more medication to weaken the muscles. I require more usually in this area as well. 
Keep in mind that these medications can take 3-5 and sometimes up to 14 days to work fully so don't make any changes until at least 2 weeks after treatment. 
Hope this helps and God Bless!
Dr. Robb