Why Tretinoin Can Suddenly Cause New Breakouts or Irritation After Months of Use
If you have been using tretinoin successfully for months or years and suddenly start breaking out — especially with painful, cystic-feeling bumps rather than the small whiteheads typical of a “purge” — it can be confusing and discouraging. The good news is that this pattern usually has a handful of well-understood explanations, and most of […]