There are more reasons for a child to have a small lump on the back of the head that moves back and forth when pressed, and common ones include enlarged lymph nodes, lipoma, sebaceous cysts, and so on. If the child has no other discomfort symptoms, there is no need to do special treatment for the time being, just continue to observe. If there are other uncomfortable symptoms, it is necessary to carry out targeted treatment according to the cause. 1, swollen lymph nodes: children with enlarged lymph nodes in the back of the head may be due to bacterial infection in the head and neck, causing lymphadenitis, resulting in lymph node enlargement in the back of the head area, and the texture of the tougher, touch is also relatively smooth, the performance of the back of the head there is a small pimple of a press back and forth, if there is a pain, you can take antibiotic medication under the direction of a doctor. Take antibiotic medication, such as cefixime particles, amoxicillin clavulanate potassium dry suspension, usually in the inflammation subsides will slowly disappear; 2, lipoma: lipoma will also lead to the child’s back of the head there is a small pimple, and lipoma’s texture is generally softer, the surface is smooth, but also back and forth activities, can not disappear on their own, that is, there is a small pimple in the back of the head a press back and forth, will also be slowly growing larger with age, usually does not happen. If the growth speed of lipoma is fast or it affects the beauty, it can be excised by micro incision, and the wound care should be paid attention to after the operation to avoid infection; 3, sebaceous cyst: sebaceous cyst is the cyst formed after the accumulation of sebum, which belongs to a kind of benign skin lesion, occurring in the head and the face, and the surface will be adhered to the skin but the base can be moved, manifesting as the lump on the back of the head. The surface of the cyst is attached to the skin, but the base of the cyst can move, manifesting itself as a small lump on the back of the head that moves back and forth when pressed. If the cyst is small, there are usually no obvious symptoms. If the cyst is large, it may cause pressure on the surrounding tissues, so you can choose to surgically remove the sebaceous cyst.