After photodynamic therapy, how long does the skin's purging process last?

Doctor Answers 2


Good question .It takes up to 4 weeks to see a result after a first treatment with PDT. A second treatment may be necessary in order to achieve the best results.

Montreal Dermatologist
5.0 out of 5 stars 3 reviews


It takes the skin 28 days on average to go through a full skin cycle.  It usually takes 2 full skin cycles to see great changes in the skin.  It is for this reason that most people wait 8 weeks to see the full benefit from a treatment of PDT.  We often will treat people with 2 treatments of PDT spaced 8 weeks apart.  We see great results with this treatment.  Stay skintastic.  

Sandra M. Johnson, MD
Fort Smith Dermatologist
5.0 out of 5 stars 5 reviews

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