11/19/2023 0 Comments Big red bumps on legs that itchIn this rare condition, an urticarial rash develops on skin exposed to water of any temperature. This is a rare condition in which an urticarial rash develops on skin exposed to sunlight. The rash can be painful and tends to last several hours, or even a day or so. For example, after wearing a tight seatbelt, or wearing a tight watch strap, or after gripping a tool such as a screwdriver for a reasonable period of time. In this type of hives the rash develops 4-6 hours after the affected area of skin has had deep prolonged pressure applied. The condition can develop alone but it commonly affects people who also have chronic hives. (For this reason, if you are known to develop cold hives, you should never go swimming alone.) Delayed pressure hivesĭelayed pressure hives are uncommon. For example, swimming in cold water may cause a widespread and severe rash over most of the body that can make you dizzy and faint. If a large area of skin has been chilled, the rash can be very extensive. The rash affects the chilled parts of the skin. It may be the cold that triggers the rash, or the re-warming of the skin after coming in from the cold. An urticarial rash develops after being exposed to cold, including rain, cold winds and cold water. However, in some cases the condition remains troublesome for many years.Ĭold hives are quite an uncommon condition. In many cases the condition tends to improve after a few years and it goes or becomes less severe. Sometimes the tiny weals join together to form larger ones.Ĭholinergic hives most commonly first develop in early adult life. In severe cases, hundreds of tiny weals develop when you run or do other types of exercise. It can be a real nuisance when trying to exercise. The sweating that triggers the rash may be due to exercise, heat, high temperature (fever), emotion or eating spicy food. Some people become slightly wheezy and short of breath for the duration of the rash. The rash lasts from 30 minutes to an hour or more before fading away. The rash appears within a few minutes of sweating and tends to be worst on the chest, back and arms. The hives rash is quite distinct as the weals are very small (2-3 mm) with a red flare around each one. The condition is caused by sweating and is sometimes called heat bumps. Cholinergic hivesĬholinergic hives are quite common. However, in some cases the condition remains troublesome for many years. In most cases, the condition tends to improve gradually over a few years and it goes or becomes less severe. It most commonly first develops in early adult life. Up to 1 in 20 people will develop dermatographism at some stage of life. However, some people develop dermatographism with just light pressure. In many cases the pressure needed to be applied to cause the rash is quite firm. The rash tends to last less than an hour. For example, it may develop more easily when you rub yourself firmly with a towel after a hot shower. Although any part of the skin can be affected, the palms, soles of the feet, genital skin and scalp are less commonly affected.ĭermatographism is more prone to occur when you are hot. The affected area of skin is usually very itchy but in some mild cases it does not itch much. The rash follows the line of the writing on the skin.) (Because of this, you could 'write' on someone's skin by applying firm pressure with a finger or other object. People with this condition develop the rash on areas of skin that have been firmly stroked. R1carver, CC BY-SA 3.0, via Wikimedia Commonsīy R1carver, CC BY-SA 3.0, via Wikimedia Commonsĭermatographism (also known as dermographism and dermatographia) means skin writing. Pine tree contact: Contact urticaria: pine tree rash For example, chemicals, latex, cosmetics, plants including pine trees, ointments, nettle stings, etc. Skin contact with some substances causes a local area of contact hives in some people.(You react to the virus.) A mild viral infection which causes few other symptoms is probably a common trigger of an urticarial rash that develops without an apparent cause. A viral infection such as the common cold or flu can trigger an urticarial rash in some people.Allergies to medicines such as penicillin, aspirin, anti-inflammatory painkillers, etc.Sometimes you can develop an allergy to a food even if you have eaten it without any problem many times before. Food allergies such as allergies to nuts, strawberries, citrus fruit, egg, food additives, spices, chocolate, or shellfish.In this type of hives, a rash appears when the skin is physically stimulated (for example, by heat, cold or pressure on the skin). Where this is the case the condition is called inducible urticaria. The physical stimulus somehow causes a release of histamine and other chemicals, which causes the rash. The reason why a rash appears in affected people is not clear. Hives can be triggered by a number of different physical causes.
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