Had Botox Now Have Little Pimples All over my Forehead and Between my Brows?

It would be helpful to know if the pimples correspond to the exact area of injections where the needle pierced the skin. If not, if the numbers of pimples far exceed the number of insertion sites of Botox needles, then maybe it is related to a disinfectant used or a numbing cream or some other cream that you started to use after the botox. Ask your physician.

This is certainly not a common side effect.  I would definitely see the doctor who did your treatment.  It may be a herpes or shingles outbreak.

The pimples can be related to several factors, however the treatment can be straightforward. Topical antibiotic solution, glycolic acid and salicylic acid cleansers can also be helpful to resolve the acne.

This sounds to me like you're actually having a reaction to the topical numbing cream that I'm guessing was applied before your Botox injections were done to help with pain. Although it's very, very, very rare, I have seen patients who are allergic to some ingredient in the topical compound and get a surface rash or contact rash from it. Apply cool water, followed by hydrocortisone, which is available over the counter, and it should clear up quickly.

 From your description, I wonder if this is a herpes outbreak or a related zoster type rash.  You may want to go back and see the MD that did your Botox Injections for evaluation and possible treatment.  This is not a typical reaction of Botox injections in the forehead.