Acne
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Glossary Terms P - R

Need an explanation, information, or definition of a common acne or skin care term? Find the answers you're looking for here.
Papule
What is a papule?
Photosensitivity
What is photosensitivity? Get the definition of photosensitivity, and learn which acne medications list sun sensitivity as a side effect.
Phototherapy
Learn the definition of phototherapy.
Pilosebaceous Unit
What is the pilosebaceous unit?
Pimple
What is a pimple?
Post-inflammatory Hyperpigmentation
Learn more about post-inflammatory hyperpigmentation (PIH).
Propionibacterium Acnes
Propionibacterium acnes are the bacteria responsible for acne breakouts. Learn more about this acne causing bacterium.
Punch Elevation
Learn more about punch elevation and how it is used to treat acne scars.
Punch Excision
Learn more about punch excision, and how it is used to treat acne scars.
Punch Graft
Learn more about punch grafting, and how it is used to treat acne scars.
Pustule
What is a pustule?
Resorcinol
What is resorcinol and how does it help clear acne? Learn more about this acne treatment.
Rolling Scars
Learn more about rolling acne scars.
Rosacea
What is rosacea? Learn more about rosacea and how it differs from common acne.
Explore Acne
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Acne
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