There are many causes of small bumps on the side of the face, such as acne, eczema, contact dermatitis and insect bite dermatitis. 1. Acne: It is related to androgen-induced, increased sebaceous gland secretions and the propagation of Propionibacterium folliculorum, which may lead to small bumps on the side of the face. 2. Eczema: Inflammatory reaction caused by internal and external stimuli, which may cause bumps on the side of the face, mostly accompanied by itching and other symptoms. 3. Contact dermatitis: contact with sensitizers or irritants on the skin of the face can cause an allergic reaction, resulting in small bumps on the side of the face. 4. Insect bite dermatitis: mosquito bites cause redness, swelling and itching of the skin and other symptoms, which may lead to small bumps on the side of the face. There may be other reasons for goose bumps on the side of the face, it is recommended to go to the regular hospital in time to check and clarify the cause.