How long after a hair transplant can Botox be injected behind the ear?

I had a hair transplant of 2000 grafts to my temples on the 6th July 2016. Unconnected, I have some aching and spasms around my right ear due to an acoustic neuroma (benign brain tumour) for which I will have 50U of botox into the superior auricular muscle and 50U into the posterior auricular muscle. How long after my hair transplant should I wait before having this botox? Kind regards