Earpiece is making a cracking sound

I have a problem with the earpiece of my phone. I had went to go watch a youtube video and I had realized that my phone earpiece was making a crackling sound. The day before it had rained and my phone had gotten a bit wet and I proceeded to dry the phone off. when I got home. I don't think that with light rain it would damage the earpiece due to the phone being water resistant or if its some bug with the new ios update.