Concise answer
A temporary increase in lesions after certain cell-turnover treatments may be described as purging, but irritation, allergy and worsening acne can look similar. Not every breakout after a new product is normal.
Timing, lesion location, burning, itch, redness and the active ingredient help distinguish possibilities.
Continuing several strong products through significant irritation can damage the skin barrier and make the picture harder to assess.
When evaluation may help
Stop and seek advice for swelling, blistering, severe burning or rapidly worsening lesions; review persistent change before assuming it must be endured.