<s>[INST] i have a hard lump on the side of my elbow,it started a couple of weeks ago and it was real small but has gradually gotten bigger now about the size of a quarter, when i go to sleep most i instinctively lay on my arm under my pillow and after about 15-30 minutes get this awful tingle sensation thru most of my arm and if flex my arm in any way it intensify s it beginning to be painful and i have no idea what its is but i am very worried i dont have money to a doctor unless i know something is wrong. [/INST] Hi.based from your description, it could be any of the following lesions: fibrous, lipoma or cystic lesions (sebaceous or gelatinous type). Other tumor lesions must also be ruled out. It is best if you consult with a doctor, preferably a general surgeon, for clinical evaluation. Diagnostics (imaging) and management (medical and/or surgical) will be directed accordingly. Hope this helps. Good day!!~ Chat Doctor.  </s>