Red and itchy pimples on the face may be caused by eczema, contact dermatitis and folliculitis. 1. Eczema: Eczema can develop in various parts of the body, such as the face, trunk and other clinical manifestations of red spots, pimples and itching and other symptoms. Its cause may be genetic, environmental factors. 2. Contact dermatitis: mostly confined to the contact area, but after scratching can be brought to other parts of the causative agent, mainly manifested as erythema, swelling and papules. Its cause may be related to skin contact with exogenous substances, such as pollen, grass pollen, fur and so on. 3. Folliculitis: Folliculitis can develop in any area where there is hair, some patients will appear in the face, usually characterized by red papules or pustules, also accompanied by itching and pain. There are many reasons for the redness and itchiness of the face, and it is recommended that patients seek medical examination to determine the cause of the problem.