Lyric discussion by eonaut 

I doubt this is what the song is actually about, but whenever I hear this, the first thing that comes to mind is parasitic infestation. Hear me out though:

Feel me in the corner Beside your mouth Feel me in the inside of the Faintest trace of sound

After first being infested by whatever parasite, the host is probably not going to immediately know, but may get that creepy-crawly sensation of something just under your skin.

It's the fire underwater Breathing while you drown Feel me in the saturation When the sun burns out

The parasite grows and becomes stronger as it depraves the host (it breathes as the host drowns), ultimately proving its existence after completely using up the host (Like how the sun provides the means for plants and animals to live, so too does the host to the parasite.

I am the one inside you And I am the one (Inside your veins) I am the one inside you Over and over I'm here again

The chorus is pretty self-explanatory. The emphasis on being inside points that this is an endoparasite like a worm, rather than something like a louse or tick. The last line could refer to the fact that some parasites never leave the host, and a new generation of parasites is born again and again.

Far beyond the bruising Something underneath Feel me in the aftermath when You learn the world has teeth

Bruises may be a telltale sign or symptom of infestation. The host may learn this after learning about the what the parasite is, then realizing that they are infested. (in this case, the world's "teeth" are all of the similar, nasty creatures you never knew existed.)

There is so much more to this than Phantom limbs for amputees Here, dissolving through the trauma This is where You'll feel the breath of me

I see this last line as the parasite speaking directly to the host's first reaction to learning about the infestation-- denial. The "phantom limbs for amputees" is the feeling of something that does not exist. In this case, the host feels the bruises and tingly feeling on their mouth is not caused by a parasite living inside of them, when in fact it really is. Finally, the parasite outright says that it will break the host's denial (dissolving through the trauma) when it matures completely, at which point the host will see for itself the parasite within, and thus feel its breath.

Just some food for thought (pun slightly intended)

An error occured.