Complex regional pain syndrome (CRPS) is a painful condition affecting a limb, associated with sensory, motor, autonomic, skin and bone abnormalities. Symptoms will present differently in different people. It is diagnosed using Budapest Criteria.
Bone abnormalities include localised osteoporosis in parts of the affected limb, which usually resolves spontaneously
Skin abnormalities include reversible changes in texture or appearance of the skin, eg the skin might appear thin or shiny