Botox administered a month ago will not cause a dent in your forehead after one month of administration. Most complications are noticed within 1-2 weeks of injections. You should see a Physician for headaches and let them look and examine your skin as well.Hope that helps and good luck!Dr. Uzma QuraishiBoard certified InternistBrandywine MedspaKennett Square, PA
Botox is great at softening forehead lines. A mild headache is a possible side effect after injections, but not one month after nor indentation. I recommend following up with your injector. All the best. Dr.Michon