“Reaction to Botox on Forehead Wrinkles”

Overall I really like what botox has done for the wrinkles on my forehead. My wrinkles we're not that bad but I wanted to be proactive to avoid additional wrinkles in the future.

I got botox for the first time about a month and a half ago. I've recently noticed that if I apply too much pressure to my forehead (resting my hand on my forehead, taking off makeup, squeezing my eyebrows together), I can see the botox clump into a bumb on my forehead. Typically this happens between my eyebrows. The bump will stay for about a minute, then relax and smooth out again. Also when this happens I get an intense pressure felling on my forehead. Is this normal? Is something wrong?