Hair Loss Around Large Bump on My Head

I recently had surgury for removal of 2 uterine cancerous tumors… the surgery went fine… but when i woke up in my room i had a very large bump on the back of my head. I mentioned it to my dr and to some of the nurses, but nobody seemed to know how it got there… anyway after the bump went away I lost all of my hair in that spot… should i be concerned or just wait for it to grow back

Sounds like something happened in surgery to cause these bumps on your head if you woke up and they were there. To lose your hair with the appearance of the bumps might confirm that. Hair loss from trauma might reverse, depending upon the type of injury. You will know in about 6 months, but I would certainly press your doctor/surgeon/anesthesiologist for what happened to you.