Pig liver is warm in nature and sweet in taste, with the effect of tonifying blood, invigorating blood, clearing liver and brightening eyes. Allergic purpura belongs to the category of purpura according to Chinese medicine, mainly divided into four types: heat compelling blood flow type, qi deficiency non-regulation type, yin deficiency fire type and blood stasis internal obstruction type. For the type of heat compelling blood flow, pig liver is warm and easy to help heat, so patients should not eat it; for the type of qi deficiency, pig liver can invigorate blood and replenish blood, patients can eat pig liver. In addition, patients with allergic purpura should eat foods containing more vitamin C such as tomatoes, oranges and kiwis, and avoid foreign animal proteins such as fish, shrimp and crab seafood. Clinical analysis of allergens in 400 cases of allergic purpura patients found that most patients are not allergic to pork, beef and chicken, but a small number of patients are allergic to corn, and patients should pay more attention to it.