The bags under the eyes suddenly swelled a small bag painless and itchy is may be lipoma, lid gland cysts, sebaceous gland cysts and so on. 1. Lipoma: the etiology of lipoma is still unclear, and it is considered to be related to heredity. If lipoma appears above the bags of the patient’s eyes, a localized lump will appear, so the patient will show that the bags of the eyes are suddenly swollen with a small bag that does not hurt or itch. 2. Blepharophalangeal cyst: Blepharophalangeal cyst is considered to be caused by the blockage of the outlet of the blepharophalangeal gland, and the patient will have a lump in the eyelid area. Therefore, patients with blepharopharyngoid cysts in the lower glands will have a sudden swelling of the bags under the eyes, which is painless and itchy. 3. Sebaceous cysts: Sebaceous cysts are mainly caused by the sebaceous glands of hair follicles being blocked and sebum gathering to form cysts. If the patient’s eye bags appear sebaceous cysts, there may be round, hardness of the local cysts, cysts in the middle part of the black pinpoint depression, the cysts around the pressure will appear white content, so the patient will have bags of eyes suddenly swollen a small bag of manifestations of pain and itchless. It is recommended that patients with a sudden swelling of the bags under the eyes without pain and itchiness, need to consult a doctor in a timely manner, the doctor will be clear after the cause of the disease to choose the appropriate measures for treatment.