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I've heard a lot about the sun actually making acne worse, and I know that Dan says that a bit of sun exposure or vitamin D is good but a lot of sun is bad for your skin.

I understand the whole cancer thing, and how that's bad for you but what is it about the sun that makes acne worse?

Nobody has ever explained that to me.

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Hi Demy,

Photosensitivity per se damages the fragile skin layer stratum corneum. When you use topicals like BP, or retinoids like Retin-A or Differin, the skin is exfoliated, becomes thinner than usual. At this state, it will not be a surprise that your skin will be susceptible to further unwanted burning and kill your healthy skin cells.

I therefore presume in this regard, that excessive sun exposure especially to retinoid treated skin or any keratolytic topicals used on the skin will worsen your acne.

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