Small red dots on the body also itch: 1, allergic diseases: such as dermatitis, eczema or papular urticaria and so on, these are allergic diseases, you can symptomatic anti-allergy treatment. If the rise of more or longer, you can also find the cause, blood test allergens, to see what things are allergic. In life to pay attention to avoid contact, so as not to recurring episodes do not heal. 2, parasitic infection: such as scabies. Scabies is a contact infectious skin disease caused by scabies, and people who live together may be infected with each other through the level of contact. The body is manifested as finger crevices, inner thighs, small stomach, vulva scrotum, buttocks and other parts, may grow red nodules especially itchy, especially at night. This should be diagnosed after the use of sulfur ointment or lindane ointment for external use, close clothing to hot water, hot washing, exposure to the sun, to kill insects, sterilization, itching, to be thoroughly treated, so as to avoid mutual contact and then spread, so as not to delay.