Signs and symptoms
Signs and symptoms of breast cysts include: 

A smooth, easily movable round or oval breast lump with distinct edges
Breast pain or tenderness in the area of the lump
Increased lump size and tenderness just before menstruation
Decreased lump size and resolution of other signs and symptoms after menstruation
Having one or many simple breast cysts does not increase a persons risk of breast cancer.Lumps in the breast are often not found during self-examinations or physical exams. However, in some cases they can be felt at touch, especially if they are larger. Breasts are usually lumpy or nodular as a result of the hormonal changes that women go through during their menstrual cycle. However, new breast lumps should always be referred to a specialist. Cysts can also be confused with infections that form on the nipple or the areola. A common cyst look-alike is a localised infection of a duct in the nipple. These can happen whether youre breast feeding or not, (if you are breast feeding it could also be a bleb) this becomes a bump that may then start to look yellow and white (pus filled). Check with your doctor if you are unsure or have other symptoms that are worrying you. Fluid leaking from a cyst, as may happen due to puncture or vigorous compression during mammography, or due to seat belt injury in the course of an automobile accident, may trigger an aseptic inflammation in the surrounding breast tissue.
Discitis, or diskitis, is an infection in the intervertebral disc space that affects different age groups. In adults, it can lead to severe consequences, such as sepsis or epidural abscess, but it can also spontaneously resolve, especially in children under 8 years of age. Discitis occurs post-surgically in approximately 1–2 percent of patients after spinal surgery. Signs and symptoms
Symptoms include severe back pain, leading to lack of mobility. Some very young children may refuse to walk and arching of the back is possible. In post-operative situations, the symptoms occur within a week and result in severe low back pain or neck pain (depending on the surgical location). If untreated, the discitis may resolve on its own, causing spontaneous fusion of the intervertebral disc space,  cause a chronic low grade infection, or progress to osteomyelitis and possibly even an epidural abscess. In case of concomitant inflammation of one or more vertebrae (in such cases usually involving the areas adjacent to the intervertebral disc spaces) the condition is called spondylodiscitis. Causes
There is debate as to the cause, although hematogenous seeding of the offending organism is favored as well as direct spread. It is important to differentiate between spontaneous discitis which is usually from hematologic spread from a urinary or respiratory infection versus that from a post-operative complication which usually involves skin flora such as staph aureus. It can be caused due to spinal tuberculosis and spread along spinal ligament to involve  the adjacent anterior vertebral bodies, causing angulation of the vertebrae with subsequent kyphosis.