How long does it take for food allergy to heal red and itchy skin

Mild symptoms with only slight redness and itching in the local area will usually completely subside in a few hours to 3 days; moderate symptoms with scattered wheals and obvious itching all over the body will generally improve in about 1 week after standard intervention; if ulceration, exudation, or severe allergies have occurred, it may take 2 weeks or even longer to fully recover, and temporary pigmentation may be left.

Last week I met a girl who was a sophomore in high school at the outpatient clinic. She secretly ate some dried mango brought by her roommate during class. Within ten minutes, the corners of her mouth became red, and she also developed several small pimples the size of pinheads. It was so itchy that she kept rubbing it with a mask. When she came in, there was some tissue fluid on the inside of the mask. The symptoms were very mild. I prescribed a tablet of loratadine and asked her to apply a cold towel on her face when she went back. She should not touch highly allergic fruits such as mango and pineapple for the next week. She sent me a message the next day, saying that the redness and itchiness were all gone without leaving any marks. She was a typical example of a very fast recovery.

Of course, there are also those who recover slowly. In the past two months, I saw a girl in her 20s. After eating a seafood buffet, she developed wheals all over her arms and legs. It was so itchy that she couldn't sleep all night long. It took me three days to come here. When she came, her arms and legs were covered with blood from scratches, and there were exudates in several places. This was already a moderately severe condition that had been delayed. I prescribed oral second-generation antihistamines, combined with weak glucocorticoid ointments, and asked her to use saline wet compresses on the ulcerated areas every day. It took almost 10 days before it was completely gone, and it took more than a month for the pigment marks on her legs to disappear completely.

Currently, the dermatology community still has some differences in intervention ideas for red and itchy skin caused by food allergies: one group advocates taking antihistamines as soon as symptoms appear to quickly control the allergic inflammatory reaction and avoid the inflammation from prolonging and evolving into chronic eczema-like changes, which will be more difficult to deal with in the future; the other group believes that if there are only very mild local symptoms and are not accompanied by systemic reactions such as chest tightness, throat tightness, and abdominal pain, it is completely possible to get rid of the allergen first, rely on one's own metabolism to recover, and avoid unnecessary drug intake. My own experience in clinical practice for so many years is that if you have never had severe systemic reactions due to allergies before, and this time it is just a small red and itchy area at the corner of the mouth or wrist, you can observe it for 2-3 hours. If the symptoms do not worsen or even slowly subside, then there is no need to take medicine at all. Just drink more warm water to speed up metabolism. If the red and itchy area becomes larger and larger, and even begins to spread to the trunk and face, don’t hesitate, take antihistamines quickly, and come to the hospital directly if necessary.

To be honest, many people’s slow recovery is really “made” by themselves. I have seen too many people turn on the hottest water when they can’t bear the itching. They feel great at the time, but after washing, the blood vessels dilate even more, the redness and itching worsens, and the recovery time is doubled. Some people just apply the powerful glucocorticoid ointment on their face regardless of where they are allergic. After the allergy was cured, he developed hormone-dependent dermatitis instead, which was not worth the loss. What's more, some people have clearly known that they are allergic to a certain type of food, but they still hold on to the luck of "I will be fine if I just take one bite", repeatedly stimulating allergic reactions. The symptoms that were supposed to be cured in 3 days are still not completely gone after half a month. Oh, by the way, it’s best to avoid spicy food, alcohol, and high-sugar foods during an allergy attack. These will aggravate the dilation of blood vessels, which will not only slow down the redness and itching, but also make it easier to leave marks.

Anyway, most people's skin redness and itchiness caused by food allergies will not last long. The premise is that you avoid allergenic foods in time, don't mess around, and don't take medicine when it's time. If the red and itchy rash really persists for more than a week, don't blindly search Baidu and use medicine randomly. It is more reliable to go to the hospital for an allergen screening - maybe you are allergic to several things at the same time, and you only avoid food, and the remaining allergens are still irritating.