i got a bump like thing in my armpit...whole shoulder till my elbow, from the inside is heavily paining. i had hurt my self there when i had worn a tight shirt and slept i had a small bruise on the day one now it has progressed into a bump..dont know if it forming a cyst...let me know wht to do
Welcome to Chat Doctor .1. The possible because one can think of after a trauma, small bruise increasing in size - infective etiology with collection of pus within.2. Then vascular abnormality also could because, finally lymph nodal enlargement due to local infection / inflammation.3. Definitive diagnosis in this case can be done after examination - I would have sent for an ultrasound examination of the swelling / lump.4. The ultrasound will give nature of the lump, its sours and extensions. 5. After that needful treatment steps can be taken.6.Meanwhile as a remedy - do not scratch / compress the area, maintain local hygiene, avoid any irritant cloths over the area for better healing, antiseptic cleaning would help. Good luck. Hope it helps you. Wish you a good health. Anything to ask ? Do not hesitate. Thank you.