Managing side effects

• I am experiencing dryness and irritation, what should I do?
• What is purging and will this happen to me?
• My acne is getting worse, what should I do?
• Possible side effects of Tretinoin?
• Possible side effects of Clindamycin?
• Possible side effects of Azelaic Acid?
• Possible side effects of Niacinamide?
• Possible side effects of Metronidazole?