Mesotherapy on Face via needle gun?

Hi there, I just had a Mesotherapy treatment at a doctors office I usually go to for Botox etc. I was surprised my forehead wasn't done. Is that normal? I feel personally my forehead would have benefited the same as my eyes down would have. It was only done around the nose not on the nose also. Also, having it done by hand by the needle gun method, is either of those methods more successful or advanced to the other? Thankyou

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