<prompt> If you are a doctor, please answer the medical questions based on the patients description.I am a 32year old female, I weigh 120lbs. I was seen 4yrs ago because of a discolorationappeared to be broken blood vessels they did a biopsy and found it to be nothing. The broken blood vessels went away and I had no problems until a few weeks ago my left arm went numb and when I rubbed it I noticed a hard lump the size of a gumball. It does not really bother me, I gave it a few weeks to see if it would go away...still no change  <response>: Hi! Thanks for your health query on Chat Doctor! Well, you have a significant medical history behind the hard lump on the lump. You had broken vessels that healed itself; you have numb left arm; and the lump appeared after you rubbed the numb area; it does not seem to reduce... I must consider following possibilities in this case:1. post-traumatic neuroma-like benign nerve tumor2. Inflammatory stromal nodule3. Neurofibroma or schwannoma4. Parasitic cyst5. Aneurysm or vascular malformation need a Dopplerultrasound study for confirmation, in addition to a clinical examination; therefore please see your doctor but nothing to worry really!regards, 