Red bumps under the eyes may be caused by mosquito bites, or blepharitis, blepharocysts and other causes. 1. Mosquito bites: Especially in summer, mosquito bites on the skin around the eyes may lead to red bumps, which may recover on their own. 2. Blepharitis: usually called wheal, mostly caused by staphylococcus, especially staphylococcus aureus infection, the affected area is red, swollen, hot, painful and other typical manifestations of acute inflammation, there may be red bumps under the eyes, touching the feeling of a hard knot. 3. Blepharophalangeal cyst: It is idiopathic aseptic chronic granulomatous inflammation of the blepharophalangeal glands, usually called chalazion. Mostly seen in adolescents or middle-aged people, may be related to its blepharoplasty gland secretion function is exuberant, manifested as a round lump under the eyelid skin, may cause red bumps under the corner of the eye. Red bumps under the corner of the eye may also be caused by other reasons, there is obvious discomfort, it is recommended to consult a doctor to determine the cause of the disease, and follow the doctor’s instructions for treatment.