disease analysis: after eating crabs, the specific crab protein enters the body through the intestinal wall and causes allergic reactions. In addition, people suffering from skin diseases such as dermatitis, eczema and tinea should also eat carefully, because eating crabs can make their condition worse. Opinion and suggestion: In your case, you are mainly allergic to eating crabs. I suggest you take chlorpheniramine tablets, prednisone tablets, vitamin C tablets and other drugs. Drink plenty of boiled water, eat more fruits and vegetables, and prohibit spicy and pungent food and greasy fried food. Be careful not to eat crabs in the future, so as not to cause unnecessary trouble. I wish you good health!