I have a lump on my right upper arm and it hurts if I sleep on that side and it I try to reach back for something in the backseat of the car or If I try to put that arm in last in a jacket. It then feels like it is on fire and some times I feel like the bones in that area pop.
Hi.it is best if you consult with a doctor for medical and physical examination especially if It's affecting your function and bothering you. It could be a simple cyst, but there are a lot of other possibilities. Further diagnostic examination and management (medical or surgical if indications are found) will be directed accordingly. Hope this helps. Good day!!~ Chat Doctor.