If the openings of the sebaceous glands are blocked due to too much sebum or keratinisation disorders, the accumulated sebum forms blackheads. Acne bacteria can multiply in the blocked glands and cause purulent inflammation, which becomes visible as red, swollen breakouts. If this occurs frequently and intensively, it is known as acne. After the breakouts have healed, an enlarged pore, sometimes a scar or, in the case of darker skin types, dark spots often remain. For blemish-prone skin, soap-free cleansing and oil-free care with pH 5.5 help to alleviate the problems – also as products to support an acne treatment.