I'm 19 and have been dealing with lower back pain for quite some time now. long car rides or shopping at the mall is all it takes for it to start hurting. there is a squishy kind of lump on my spine and the left side is firm. any idea on what this may be

Could be serious: Chronic low back pain in a teenager is always a concern. This could be due to a congenital defect in the spine or inflammation of the spinal soft tissue. A good history and examination along with some simple blood test and x-ray exam should be able to establish diagnosis and plan treatment. You should see your pcp, rheumatologist or sports medicine specialist.

Simple vs serious: Our bodies always have things that grow and change. Skin, fat, muscle, lymph nodes, bones, can change shape, get larger, more prominent due to many factors. The vast majority are not cancer but simply unusual growths like fatty tumors, cysts, skin tags, moles, etc. Most cause no symptoms and can be watched. If they cause symptoms or change colors, bleed, bruise or hurt, then see your doctor.