Inexplicable red dots on the body are very itchy: 1, mostly seen in allergic dermatitis, because allergic dermatitis may cause local or widespread allergic disease changes in the skin after some allergic reactions, so there may be inflammatory red dots, and accompanied by itching symptoms; 2, these red dots may also be the initial manifestation of urticaria, especially for papular urticaria, which is mainly due to The symptoms may also occur due to allergic skin disease caused by mites or other insect bites, and accompanied by varying degrees of itching; 3, may also be caused by drug allergies, such as drug rash will also appear these large red papules, and accompanied by itching.