A woman wants some information about rosacea, a skin disorder typically characterised by facial redness, pimples, or thickened skin. She uses a mild cleanser twice daily and rinses with cold water, following with an oil-free moisturiser. She's tried rose hip oil but without effect, avoids alcohol, sugar and grains, and takes chlorella. What else should she be doing? Rosacea is commonly set off by monosodium glutamate (MSG), often found in Chinese food, so be on the lookout for that connection. Alternatively, nightshade plants (potatoes, tomatoes, aubergine and peppers) could be triggering your flare-ups, so remove them from your diet for a while and see what happens. If there's a connection, stay away from belladonna as well; that homeopathic remedy is a member of the nightshade family. A freelance health and beauty journalist wrote in to warn against using any kind of soap at all, regardless of what it says it's made of. Soaps are made using caustic soda, so opt for non-soap cleansing bars. Dermalogica do one and so do other skin care companies. In addition, avoid any toiletry products containing petrochemicals. A number of products are based on pure plant extracts and have no petrochemical derivatives, such as Henry Tianus, A'kin and Prima Vera.