What causes a hard lump on the arm?
Patient: I am a 32year old female, I weigh 120lbs. I was seen 4yrs ago because of a discoloration(appeared 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 Doctor: Hi! thanks for your health query on HCM!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 malformationYou need a doppler/ultrasound study for confirmation, in addition to a clinical examination; therefore please see your doctor but nothing to worry really!regards,