How to Introduce New Products Without Flares

By Dr Magnus Lynch
MA(Cantab) DPhil(Oxon) MRCS FRCP
Consultant Dermatologist & Dermatological Surgeon

Introducing any new product to rosacea-prone skin can feel like a gamble. The skin's compromised barrier and heightened sensitivity mean that even products labelled "for sensitive skin" can cause stinging, burning, or a flare-up.

Why do new products sting?

Stinging or burning on application is a sign of a compromised skin barrier. Rosacea-affected skin has microscopic cracks in its protective outer layer, which allows ingredients to penetrate too deeply and stimulate nerve endings, causing the sensation of irritation. Common culprits include fragrances, alcohols, essential oils, and even some active ingredients like acids or retinoids.

How to patch test and slow-introduce safely?

Before applying a new product to your entire face, always patch test. Apply a small amount to a small area, such as the back of the cheek or jawline, for 3-5 days. If no redness or irritation occurs, you can proceed. Introduce a small amount of the product to your face just 2-3 times a week at first, gradually increasing the frequency over several weeks as your skin adapts. This gives your skin time to build tolerance and minimises the risk of a major flare.

Related articles

• A Simple Rosacea-Safe Skincare Routine
• Best Ingredients (and Worst Irritants) for Rosacea
• Moisturisers That Don’t Sting Sensitive Skin
• Minimalist Routine for Rosacea

About Dr Magnus Lynch

I am a London-based Consultant Dermatologist and Dermatological Surgeon. I am highly experienced in skin cancer diagnosis and treatment, Mohs micrographic surgery, facial reconstructive surgery, laser treatments, regenerative dermatology, acne, rosacea and acne scarring. Since 2019, I have been passionate about sharing information online about dermatology and skin care. 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 and skin cancer diagnostics, and I constantly aim to translate the latest findings into better patient care. You can learn more about my Research.

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.

How I can help

My NHS practice is at Guy's Hospital. I consult with private patients at several well-appointed and conveniently located sites across central London:

• London Bridge Hospital: Conveniently situated within The Shard, next to London Bridge station.
• Skin55 Ltd: Located at 55 Harley Street, this beautiful Edwardian building houses one of the largest private dermatology facilities in the UK with a comprehensive laser suite.
• OneWelbeck: Located close to Bond Street underground station. Mohs surgery, lasers, and other skin surgeries are performed in the state-of-the-art surgical suite here.

A new consultation is £250, a follow up consultation is £220. For more information on fees, please visit Prices.