What causes red lump on arm?
Patient: Hello, my girlfriend is 31 years old, 5 feet 6 inches, and 125 lbs.  She discovered a lump on her arm two days ago.  The lump is underneath her skin, toward the inner bicep and just above her elbow.  At first it was painful when pressed and has become more tender since.  Over the past two days it seems to have grown and is now about 1/3 the size of a golf ball.  It is red and does not move.  Any idea what this might be?  Thank you. Doctor: Hi,Dear,Good Evening from INDIA.Thanks for the query to HCM.I went through all the details of your query. on the details given by your query,In my opinion you suffer mostly from-though the information given in your query is less-on the facts there in-mostly you suffer from-lump with a bug bite mostly,as its red and non-movable.Treatment suggested would be-a-Tab NSAIDs x 5 days b-Cold compressesc-Tab Antihistaminic drugd-Antibiotics if need beconsult ER doctor for the script of drugs.Hope this would resolve your query.Welcome for any more query to HCM and ME,in this regard.Wishing you fast recovery.Write review ASAP with strong recommendations for HCM and for ME,for the benefit of other new and old patients.Have A Good Day.With Regards,Dr.Savaskar M.N.