What causes skin rash

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The skin rash, featuring fluid-filled blisters and reddened areas that itch intensely, is caused by an irritating oil, urushiol. Urushiol binds to skin cell walls, changing their configuration, so that the body's immune system no longer recognizes these cells as belonging to the body and attacks them as foreign. Some people are susceptible to the rash, and others aren't, but reactions can change during a person's lifetime. Someone who was formerly not subject to it may become very sensitive, and vice versa.

Urishiol is an oil and is not washed off by plain water. People have had success in lessening the rash by wiping the area clean with alcohol, or mild soap, in order to break down the oil. However, laundry detergent or Fels-Naphtha soap work much better, but vigorous rubbing is necessary. If you are desperate, you could also try wiping the area with other solvents, like acetone (nail polish remover). Some article advise against this because it will deprive your skin of moisturizers to protect you from the oil. However, the oil is obviously having an effect on your skin, and you can always put lotion on the area later.

Normally, it takes about twenty-four hours for the rash to first appear, though it may worsen during the next few days and may appear to spread, when in fact what is happening is that areas that received a lesser dose are latently reacting. The rash takes one to two weeks to run its course, but normally does not leave scars. Severe cases will have small (1-2mm) white fluid-filled blisters on the skin.

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What causes skin rash