If I was diagnosed with multiple myeloma in December, can I still get Botox?

There is no reason, that I know of or can think of, why you should have any more risk than anyone else. You might feel better when you look more relaxed and rested. 

There is no restrictions on people with cancer and Botox.  People with neurologic disease, MS, ALS, can be affected more severely by Botox and probably shouldn't get Botox.