Hello, allergic dermatitis is mainly caused by poor resistance, allergic constitution and bad living habits, so we must pay more attention to diet. Can't eat spicy food, irritating food, cold food such as seafood. It is suggested to use Huanqing Wuyuan ointment externally, eat more foods containing vitamin C, drink more warm water and exercise more to enhance resistance. This treatment has to go through a process, and it usually needs to be recovered slowly.