Small bumps on the face during the change of season may be related to eczema, acne and contact dermatitis. 1. Eczema: the cause of this disease is unknown, it is an inflammatory disease of the skin caused by internal and external factors. Climate change during the change of season may trigger eczema, which can lead to red pimples on the face, accompanied by itching, tingling, redness and other symptoms. 2. Acne: If you don’t pay attention to facial hygiene during the change of season, and often consume oily and spicy food, resulting in more oil secretion, and don’t clean it up in time, it can lead to pimples, papules, pustules, etc., which can be manifested as small bumps on the face. 3. Contact dermatitis: common in allergic people, in the change of season if contact with pollen, willow and other substances, is likely to cause facial skin allergies, resulting in red spots on the face, pimples, pimples performance, can be accompanied by obvious itching, pain and other symptoms. Seasonal bumps on the face may also be other diseases, if the small bumps continue to not go away, you should seek medical attention as soon as possible, under the guidance of the doctor for treatment.