Red bumps on the face may be caused by acne, contact dermatitis and pityriasis rosea. 1. Acne: due to exuberant secretion of sebaceous glands, clogged pores and bacterial infections, it can cause pimples, pustules, acne and other lesions on the face, manifesting as red bumps on the face. 2. Contact dermatitis: allergic reactions may occur when the face is in contact with cosmetics, skin care products, masks and other items, causing symptoms of long red bumps on the face, and the use of such substances should be stopped promptly. 3. pityriasis rosea: related to human herpes virus infection and cellular immune abnormalities, typical skin lesions covered with furfuraceous scales of rose-colored macules, macules, can be manifested as long red bumps on the face. The red bumps on the face should go to the hospital in time to improve the examination and give targeted treatment after the cause is clear.