Hi, As per your complain eruption of a pimple like bumps and rashes all over the body which looks like pimples and also can are itchy can be due to common causes like: CONTACT DERMATITIS that is an allergic reaction which occurs when skin comes in contact with certain agents that your body is allergic to like skin cosmetics, detergents, soaps, fragrances, leather, latex, poison ivy etc... FOLLICULITIS or generalized hair follicle infection caused by Staphylococcus bacteria leading to the formation of painful bumps over different parts of the body... Another cause can be the food allergy or side effect of medicines... I would suggest you consult an Allergist or an Infectious Medicine Specialist and get evaluated and a thorough clinical evaluation and investigations like blood tests to rule out allergies and infection, microscopic examination of scrapings from the lesion can help.. As of now you can take anti-allergics like Benadryl for relieving itching and do cool compresses over bumps.. Once the cause is ruled out it will be treated accordingly.. - In case of Contact Dermatitis, you will be advised antiallergics, topical steroid ointment application and also avoiding exposure to the allergen when it is ruled out... In recurring conditions, Immunotherapy will be advised to you.. -In case of folliculitis antibiotics, oral and topical and topical steroids can be advised along with anti-allergics to control itching.. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Honey Arora, Dentist