Permanent bumps and lumps on my forehead after botox (Photo)

I have been having botox for over 20 years every 4- 6 months. About a year ago i have noticed prominent bump on the left side of my forehead (im asssuming its my muscles still trying to work). I have waited longer than usual before having botox there in hope that it should help, however after having my injections again (4 month ago) i have noticed more bumps and my forehead never looked more uneven which is very upsettting. Would anyone have any suggestions what could be done here to fix it?