It actually is possible and is likely the issue, even when it doesn’t look like it is swolen or bruised from the outside.
A good example are the xSIIDs, People install and even after a couple of weeks the LED is not very bright, but when the swelling goes, they are beaming from ear to ear and from their xSIID.
What I am trying to say is, give it another 5-7 days, it should make a huge difference.