Hi, the lump may not be related to the stroke. The 'lump' could be a sebaceous cyst, a lipoma, mastoid bone infection or lymph nodes. They could also be herpes infections, cysts, yeast infections and infected hair follicles. If there is accompanying swelling, redness, discharge and fever it is most probably an infection. You may need to consult your primary care physician who will examine you and initiate appropriate therapy. Regards.