If, like me, you are diagnosed with dry and sensitive skin, you need an oily pre-cleanser, a gentle toner, foaming facial wash, moisturiser and extra-rich moisturiser. Sher products are particularly effective for acne.Every Sher client fills out a detailed questionnaire that deals not only with skin but also with lifestyle, and is prescribed an individual selection of products for their particular skin type. "If you are baking a cake and you leave out two ingredients, you won't have the cake you wanted," says Helen. People can even become agoraphobic because they don't want anyone to see them."The Sher system is a range of products that are designed to be used together for maximum effect - mixing and matching with other ranges is not recommended.

"I actually call myself a skin psychologist, because skin problems can be so depressing. Other problems such as acne are rarer in older people, and are likely to be inherited or down to a hormonal problem.Skin specialist Helen Sher says that she sees lots of women in their thirties with problem skin. But, he says, such creams treat the effect, not the cause, of the disorder. At higher strengths it can cause thread veins and fragile skin, but that is after long-term use - a few days every so often won't cause problems". Eczema is probably caused by an allergic reaction to something on the skin - cosmetics, jewellery, perfumes, nail varnish and hair dye can all cause it."The conventional remedy - hydrocortisone cream - is, he says, "very weak and unlikely to cause any harm.

"In the short term it usually reacts well to intensive moisturising. "The older you get, the more likely you are to get one form of eczema or another, because the skin is drier," he says.

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But when you're afflicted with a hugely obvious glowing, flaking, burning patch of skin right on the front of the neck, a beacon which visibly transfixes anyone you speak to, you do tend to want some kind of treatment.According to Prof John Hawk, consultant dermatologist at St Thomas' Hospital in London, adult-onset eczema is relatively common. I was reluctant to use steroid creams for any prolonged period because they are known to thin and irritate the skin in the long term. When the creams had little effect, he sent me to a dermatologist who prescribed more and stronger creams.But are adult-onset skin problems so rare? I was amazed by the number of my girlfriends in their early thirties who admitted that their skin had never been so bad as it is now, even in the worst throes of puberty. My doctor diagnosed "adult-onset eczema", and prescribed steroid creams, adding that the condition was "very rare".