will photodynamic therapy permanently decrease the size of the sebaceous glands or is it only temporary?
Photodynamic Therapy (PDT) can temporarily shrink the sebaceous glands (think grape to raisin) for a period of time. Sometimes when a few PDT sessions are administered in sequence (around every 3-4 weeks), the effect can last 6 months or longer. At any rate, the effect is not permanent and usually one needs to have "booster" treatments to maintain the nice improvement.
