LUMPS appearing all around head/neck

Hey guys,

I have recently discovered various lumps all around my head/neck area. I have three on the back of my head all varying in sizes. One in the middle, one on the right and one on the left.

Alongside these lumps, I have one at the back of my neck in the shape of a pea. It is on the left side.

Some symptoms I have noticed are; enlarged lymph nodes under my chin, always full of mucus, tinnitus (not sure if related) and my voice feeling off.

At first, I thought these could he symptoms of an osteoma, but after worrying myself more, I have seen relations to throat cancer. I took a photo of inside my mouth and noticed some small lumps forming at the side of my mouth. I have attached said photo to this thread.

I have been full of mucus for a good few years now but have only just noticed the swollen lymph nodes and lumps on head.

Could this just be a sinus infection or is it something more serious?

Age: 18
Gender: Male