A long tumor on the back will have pain when pressed mostly refers to the swelling on the back with pressure pain, and the common causes are folliculitis, lipoma, epidermal cyst, spinal tumor and so on. 1. Folliculitis is a common skin lesion, mostly caused by bacterial infection of hair follicles, which can appear in the head, neck, back and other parts. The common symptom is one or more raised pimples on the back, which may be accompanied by pain. 2. Lipoma is a kind of lesion caused by benign hyperplasia of adipose tissue, which can appear in all parts of the body, including the back. It is usually slow-growing, with clear boundaries and no pain. However, when the lipoma is large and presses on the surrounding tissues, pain may occur. 3. Epidermoid cyst is a semi-circular cystic swelling formed when epithelial cells grow inside the dermis due to friction, trauma, surgery and other factors, resulting in the destruction of the structure of the hair follicle. Pain can occur when inflammation or infection occurs. 4. Spinal tumor is a tumor primary or secondary to the spine, there are benign tumors and malignant tumors, such as osteosarcoma. It may appear as a mass in the back, and pain may appear when the tumor compresses the nerves and surrounding tissues. There are more reasons for back lump with pressure pain, and it may also be related to abscess and other diseases. If the symptoms continue to be unrelieved, it is recommended to consult a doctor in time to clarify the cause of the disease and carry out targeted treatment.