Tips for PIO Injections

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Hi all, I just started PIO injections yesterday and I feel like I did everything right - I warmed it up with my body heat beforehand, massaged the site after (though prob could’ve done more), tried to move around afterward to get blood flowing, and applied a heating pad to the area for several hours after. But it’s still super sore. I know that’s normal but curious if all have any other tips/tricks or did you just deal with it? Thanks!