My Macbook Is Making A Weird Noise

I don't think it's a sound quite like a 'clicking' noise and it's not coming from the fan I don't think. I put my ear against the part of the macbook where the screen meets the body and I found the noise coming from near the area where the esc button is on the top left part of the keyboard.

I don't know how to fix it or what it even is. For context, I got my macbook 3 years ago. I wouldn't describe it as a 'clicking' noise but maybe the sound of a loud and busy processor (That might sound dumb) is it anything to worry about? How do I fix the noise?

Thank you