Seafood allergies can cause symptoms such as itchy skin and rash. You can take oral antihistamines, such as cetirizine or loratadine, to alleviate the symptoms.

If the itching is severe, you can have intravenous treatments with dexamethasone, a large amount of vitamin C, and calcium gluconate, among other antiallergic treatments, to ease the symptoms. It is also advisable to drink plenty of water and eat fresh vegetables and fruits to supplement vitamins, which can be beneficial for recovery. Avoid spicy, stimulating foods and yeast-containing products, and be cautious with your diet to avoid allergenic foods.

If necessary, go to the hospital to identify the specific allergens to clearly understand what you are allergic to, which will help in avoiding allergic reactions in the future. If the itching is severe and accompanied by obvious rashes, topical calamine lotion can be applied to the affected area for its anti-inflammatory, itch-relief, and astringent properties, promoting recovery. If the condition is severe, further medical examinations and treatments in a hospital are essential to prevent a serious condition from developing.

(Use of medication should be under the guidance of a physician)