Or cream, it was bruise cream at my last school.
Friend has a marble windowsill fall on his head and give him a concussion and the nurse was like: ok he's saying he's fine, so gave him some bruise cream and sent him back to class. He had a massive headache the next period and went home with it. Next day he comes in with the headache and passes out in PE. They send him to the hospital immediately and were like "why the hell didn't you tell anyone" and he said something which I remember to this day: "Idk, my head just hurt a little" lmao