How many days will it take for the red, swollen and itchy face to heal due to food allergy?

There is no uniform recovery time for facial redness, swelling and itchiness caused by food allergies. Mild symptoms can completely subside in 1 to 3 days, and moderate symptoms can be gradually relieved in 3 to 7 days. Severe allergies may take 1 to 2 weeks or even longer to recover. In rare cases of severe allergic reactions involving the respiratory and digestive systems, symptoms may be delayed and require clinical intervention to control. To put it bluntly, it is about the same as how quickly a bruise disappears after a fall. It is related to personal constitution, allergen intake, and correct care. It cannot be generalized.

Last month, a little girl who just entered college came to the clinic. She said that she and her classmates ate half a mango at noon. In the afternoon, the area around her mouth became red, itchy and hot, but she felt no other discomfort. I asked her to go back and apply a cotton pad soaked in normal saline solution on her face, take one loratadine, and stop touching the mangoes or rubbing the skin with facial cleanser. The next day she sent me a message saying that the red marks were basically gone and the itching was gone. This is a typical mild food allergy. The intake of allergens is small and the person is not allergic. The recovery is very fast.

But not everyone has such good luck. Last week, an old patient came for follow-up consultation. He has a history of atopic dermatitis and is allergic. A few days ago, he ate a cookie without paying attention to the ingredient list. It contained crushed peanuts. His entire face was swollen to the point where there was only a slit left for his eyes. He also had interstitial fluid leakage from time to time. He took antihistamines for 5 days in a row, combined with local short-term application of weak hormone ointment, and it took 7 days to almost disappear.

Regarding whether to take medication immediately after allergy, there are always two different views in clinical practice, and it is impossible to say who is right and who is wrong. Some doctors prefer to "don't use medication if possible." They believe that food allergy is essentially an attack by the body's immune system mistaking ingredients in food for enemies. It is self-limiting. As long as there are no systemic symptoms, the body can metabolize the allergenic immune complexes on its own. Taking additional medication may increase the burden on the liver and kidneys. There is a dermatologist colleague around me who is allergic to seafood and has itchy face. He does not take any medicine and only relies on cold wet compresses two or three times a day. The condition is completely gone in two days. Other doctors recommend early intervention, believing that timely use of antihistamines can quickly suppress allergic reactions and prevent inflammation from repeatedly irritating the skin barrier. Otherwise, what is originally a transient allergy will turn into chronic sensitive skin, which will become red and itchy in the future, which will be more troublesome. In fact, there is no problem with both options. It all depends on your own situation: if this is the first time you have such symptoms and the degree is very mild, except for local slight redness, swelling and itching, there is no other discomfort, you can observe it first. ； If you have experienced aggravation of allergies before, or you have allergies yourself, it is definitely safer to take medicine early.

To be honest, I have seen too many allergies that were supposed to be cured in two or three days, but were so forced that they could not be cured in half a month. Don’t underestimate the things you do casually “thinking it will soothe you”: For example, if you feel itchy and can’t bear it, you may burn your face with hot water. It may feel comfortable at the time, but high temperature will dilate blood vessels, aggravate inflammation and exudation, and make redness and swelling worse. ； Some people think that their face is not clean due to allergies, so they wash it with strong cleansers, and pile all kinds of soothing masks and repair essences on their faces. Maybe the preservatives and fragrances in the products will aggravate the irritation. ； What's more, they randomly buy powerful hormone ointments and smear them on their faces. After applying it for three to five days, it disappears. However, the symptoms rebound within two days of stopping the medication, and instead turn into hormone-dependent dermatitis. After several months of tossing, the symptoms may not be completely cured. I met a young man before who was allergic to cashew nuts. His face became swollen after eating half a cashew nut. He applied powerful hormones at home for half a month. When he finally came to see a doctor, his face was completely red. It took more than three months of treatment before he slowly recovered.

By the way, if your face is red, swollen and itchy, and you also feel a tight throat, difficulty breathing, stomach cramps, or even dizziness and inability to stand, don’t worry about how long it will take to get better. Go to the emergency room immediately. This kind of severe allergic reaction cannot be easily overcome. Severe cases can cause laryngeal edema and anaphylactic shock, which are life-threatening.

I have been a dermatologist for almost ten years, and I have met between 1,000 and 800 patients with food allergies. Most of them can basically get rid of their food allergies within a week as long as they don't mess around, strictly avoid allergenic foods, and do basic soothing care. If it really continues to be red and itchy for more than a week, don't search for home remedies and try random remedies. Go to the hospital to see a doctor to see if it is combined with other skin problems. It would be bad if you delay.