2. Reason:

(1) Cabbage, whose seeds look like buttons, is called "button dish", also known as "revolutionary dish", and its scientific name is Solanum nigrum. Its tender stems and leaves are mainly collected and eaten, and the picking quality is the best when the petals are just exposed.

(2) Chemical composition of Chinese cabbage flower: containing solanine, solanine, solanine, saponin, vitamin C and resin. Make cabbage cold, bitter and slightly sweet; A little poisonous. Eating cauliflower often can lead to poisoning.

3. Cabbage has medicinal value. According to Compendium of Materia Medica and Encyclopedia of Pharmacopoeia:

(1), cauliflower has anti-inflammatory, protective effects on animals' allergies, burns and histamine shock, and can promote the formation of antibodies; It can inhibit the utilization of peripheral glucose, so it has the effect of raising blood sugar. In addition, it has the functions of relieving cough, eliminating phlegm, and exciting smooth muscle and central nervous system.

(2) Cabbage is mainly used for clearing away heat and toxic materials and diuresis. It can be used for the treatment of sores, carbuncle, swelling, eczema, dysuria, senile chronic bronchitis, leukorrhagia, prostatitis and dysentery.

If skin allergy is considered, it is recommended to use Fusang Borneol Acetate Ointment or Acyclovir Ointment for external use, with the best effect. You can eat some Fangfeng Zhiyang granules or loratadine for treatment, and you can't eat spicy, irritating and allergic foods.