 [ Symptoms ] is it ok to spend a little time in the sun when taking hydrochlorothiazide which i take once a day [ Disease ] it certainly warrants having a doctor check it out you could be dealing with a hematoma    a blood clot in the tissue that could compress a nerve or cause some other problem not to be confused with deep venous thrombosis which is something different entirely  you can start with a visit to your primary health care provider he or she may order an x ray or ct scan of your triceps to see if there is a hematoma hiding in the tissue of your arm if there is your doctor may wait to see if the body successfully cleans up the excess blood cells otherwise a minor procedure may be required to remove the knot usually these types of big bruises heal up with no treatment at all however given that you are still noticing a lump two months after the injury it does not hurt to have it checked out wishing you well