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How Long Does A Rash From Allergic Reaction Last. How long does it take to recover from an allergic reaction. The reaction can also cause these serious skin reactions. DRESS is a rare type of drug rash that can be life-threatening. The rash will likely clear up without complications in two to three weeks as long as the person is not re-exposed to the allergen.
In that case the hives and rashes will last for longer than they usually did in previous situations. Things like tightened airways might even take months to go to normality. Similarly you may ask how long does an allergic reaction to sulfa last. A DRESS rash looks red and often begins on the face. DRESS is a rare type of drug rash that can be life-threatening. In most cases rashes are left untreated to clear on their own.
If your skin allergy is hives it can last a day or two.
Things like tightened airways might even take months to go to normality. If the exposure to the allergen continues such as during a spring pollen season allergic reactions may last for longer periods such as a few weeks to months. The reason you have a rash is because your body overreacted to something it thought was dangerous. Most light cases of allergy only need a couple of hours to extract the allergen out of your system. Things like rashes could take a couple of days depending on the severity to heal from on the occasion that you dont scratch it otherwise it will take even longer. How long does it take to recover from an allergic reaction.