It all depends whether it has a head on it ready to squeeze. Take a look in the mirror, if it's not ready leave it alone & if it is still leave it alone, else you'll make a mess of your mirror!
If it's any where around your face area I'd go to the doctor or nurse at the surgery asap.
Anywhere else - it's ok we don't need to know - keep it clean & see what happens in the next couple of days. If it's not getting better go to the docs.