[Acne] Does switching from one form of Vitamin A to a stronger form cause more purging?

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So up until about a week ago, I was using adapalene gel every day for the past couple of months, and it really worked like a charm and cleared up my skin (with the occasional under-mask breakout). I know that adapalene is one of the weaker forms of vitamin A, so I decided to switch to tretinoin a week ago, and developed a new round of breakouts all over my face.This is confusing to me because, when I first got on adapalene, I already experienced pretty significant purging before my skin cleared up. So in my mind, how can tretinoin cause another purge if the adapalene already did it first and cleared the problem pores out? Do you guys know if switching to tretinoin from a less potent vitamin A can cause new purging?
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Submitted by Active-Anteater-