What is benzoyl peroxide?

Benzoyl peroxide is a topical antiseptic that reduces the quantity of bacteria in the skin. Naturally occurring skin bacteria including P.acnes contribute to the formation of acne lesions. Benzoyl peroxide also helps to reduce blockage of hair follicles that leads to whiteheads and blackheads.

5% benzoyl peroxide is available in gel and face-wash formulations without prescription and is present at lower concentrations as an ‘active’ ingredient in a number of over the counter products such as cleansers. It is additionally included with other prescription-only topical treatments such as retinoids (e.g. epiduo) or antibiotics (e.g. duac). These are known as combination treatments.

Benzoyl peroxide can be an effective treatment for mild acne, however it takes several weeks until you start seeing the effects. On its own It is not a suitable treatment for moderate or severe acne.

Benzoyl peroxide is a safe treatment, that is usually well tolerated, however it can irritate the skin - particularly if used in large quantities. It can also make your skin more sensitive to sunlight and can bleach clothes and hair.

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Dr. Magnus Lynch, Consultant Dermatologist

About Dr Magnus Lynch

I am a London-based Consultant Dermatologist and Dermatological Surgeon. I am highly experienced in skin cancer diagnosis, Mohs micrographic surgery, acne, rosacea, acne scarring and laser treatments. I studied at the Universities of Cambridge and Oxford, and completed my dermatology training and Mohs fellowship at the prestigious St John’s Institute of Dermatology. I graduated from medical school in 2003 and have worked exclusively in Dermatology since 2012.

I lead a research team at King’s College London investigating the molecular biology of skin cancer. In recent years I have been involved in Media Appearances, including the Channel 5 series 'Skin A&E', where I perform skin surgeries and treat various skin conditions. Filming for the next series has recently completed and the series will be released later in 2025.

My NHS practice is at Guy's Hospital. I consult with private patients at the London Bridge Hospital, OneWelbeck (near to Bond Street station) and on Harley Street. A new consultation is £250. Book A Consultation.

I am the founder of Revessa Health which provides online consultations for acne and rosacea across the UK (see below).

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