I have been experiencing severe migraines bi-monthly for 2 months now, I have unusual bruising on my legs, I had a ct scan last week that was negative but today I notice a large soft lump on upper back between my right shoulder blade and my spine the area is very sore and my right arm is hurting as well.  What can be done to determine what this is all about?I am 46 years old, in good health with no significant health history.
Thanks for your question on Chat Doctor. I can understand your situation and problem. By your history and description, possibility of either lipoma or sebaceous cyst is high. Lipoma is fat containing benign swelling, and it is common on back. Same way sebaceous cyst is also common on back. Usually these are painless in nature. But if infected than they cause pain. So better to consult doctor and get done clinical examination and ultrasound examination of local part for the diagnosis of this lump. You may need surgical removal if it is infected. Hope I have solved your query. Wish you good health. Thanks.