Why am I experiencing cystic acne +whitehead flare 24 hours post Infini treatment?

Talc is most likely the culprit here. It traveled down the channels created by the microneedles and became a nidus for infection. Keep in mind that I consider this procedure a sterile procedure. Breaking down the skin barrier opens up the skin to infection very easily. I use growth factors - Lifeline Stem Cell, Clindamycin Gel after the procedure. No other products should be used while these channels are open, at least until the morning. Acne occurs sometimes in patients which are acne prone, and in those I continue the clindamycin and sometimes give oral Minocin.

Most likely, the talc applied following the Infini procedure is causing your acne flare.  After Infini, hundreds of microchannels are opened in the skin. The talc penetrated these channels and caused irritation.  Our office has patients apply only a medical grade growth factor product for the first day after treatment, since penetration of any applied products is exponentially increased due to these microchannels.    Occasionally, patients with a history of acne may experience a mild flare after treatment, so the combination of the talc and your history of acne are both probably contributing.  Follow up with your provider.  They may recommend oral or topical antibiotics to minimize the acne. 

I think the talc applied directly after treatment is the culprit.  The microneedling of Infini leaves thousands of small microchannels that penetrate through the skin.  Talc can work its way down into these channels and cause an intense reaction.  Sorry to have this happen to you.  Don't blame this on Infini, but rather what was applied afterwards.  After an Infini treatment at our office it is only pure medical grade hyaluronic acid such as Hyalis for the first 24 hours.  Ice cold compress for swelling.  OK to return to usual products after 24 hours except for any 'scrubs' and Retin A for at least a week.