Indicationsoily skin with imperfectionsconcentrate active serumuseteen derm k concentrate should be applied on the morning and the evening to the face cleansed with teen derm gel. apply directly to the imperfections.propertiesthanks to a combination of 5 actives of the latest generation, teen derm k concentrate is perfect to treat severe to serious acne.1. the glucono-delta-lactone (pha) gentle exfoliates the skin to remove excess sebum2. the glycolic acid acid (aha) exfoliates excess sebum3. the zincidone inhibits 5 alpha reductase4. the salicylic acid (bha) exfoliates and dries the skin5. the 5 alpha-avocuta controls sebum secretion and is anti inflammatory