These areas, known as weals, can appear anywhere on the body and may move from one site on the skin to another over a 24-hour period," Kluk says. The cause of the rash is not known in more than half of cases and it is commonly a one-off event. If you have persistent urticaria, you may be referred to a skin specialist (dermatologist). Although the affected area may change in appearance within 24 hours, the rash usually settles within a few days. Urticaria can usually be diagnosed by examining the distinctive red rash. If your symptoms are very severe, your GP may prescribe other medications, such as a short course of corticosteroid tablets. Fortunately, most cases of stinging nettle poisoning result in dermatitis only. You may have to take them regularly for as long as your symptoms last. It's still important to get help from a GP if you need it. to complete our online survey, © 2020 - Welsh Ambulance Services NHS Trust, acute urticaria – if the rash clears completely within six weeks, chronic urticaria – in rarer cases, where the rash persists or comes and goes for more than six weeks, often over many years, narrowing of the airways, which can cause wheezing and breathing difficulties, an allergic reaction to latex – which can be a common problem in healthcare workers, infections – which can range from relatively trivial, such as a, certain medications that can cause urticaria as a side effect – including, physical triggers – such as pressure to the skin, changes in temperature, sunlight, exercise or water, prolonged pressure on the skin – this can happen by wearing tight clothing, medications – such as NSAIDs, and the painkiller codeine, certain food additives – such as salicylates, which are found in tomatoes, orange juice and tea, exposure to heat, cold, pressure or water, what you had to eat just before it began and details of your usual diet, if you started taking any new medication just before your symptoms began, if you live or work in an environment where you come into contact with possible triggers – such as pets, chemicals or latex gloves, if you were stung or bitten by an insect just before your symptoms started, your current state of health and if you've had any recent infections, if you've recently travelled to a foreign country and if so, where, if there's a history of urticaria in your family, a full blood count test (FBC) – which can identify, tests to determine the levels of antibodies in your blood, a stool sample – which can identify intestinal parasites, an erythrocyte sedimentation rate (ESR) test – which can help to identify problems with your immune system, thyroid function tests – which can be used to check for an, liver function tests – which can be used to check if you have any problems with your liver, increased vulnerability to infection, particularly. Possible side effects of corticosteroid tablets include: Long-term use of corticosteroids for chronic urticaria isn't recommended for the reasons mentioned above. Urticaria – also known as hives, weals, welts or nettle rash – is a raised, itchy rash that appears on the skin. However, chlorphenamine may be recommended if it's believed that the benefits outweigh the risks. It's not known why autoimmune urticaria develops, although it can sometimes occur in combination with other autoimmune conditions, such as: Chronic urticaria can also be linked to other chronic illnesses and infections, such as: Chronic urticaria tends to come and go. The Allergy UK website has more information on: Avoiding or cutting down on foods that contain these chemicals may improve your symptoms. Stinging nettle is a broad-leafed plant that can cause burning Penile rash can result from a number of different causes, and evaluating other symptoms in conjunction can help identify the cause. 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