It can be many things, a cyst. It's not often the clavicle area is involved in oropharyngeal cancer, but can, and if it is I believe is not a good area like you mentioned being low in the lymph chain, and might be level V. I tried looking through your posts, and can't see your name, info, but that area can also involve other type of cancers, breast for example. HNC lymphs drain down, others type cancers can drain upward. Lymph nodes can be hard or soft. When small they can be soft, and when they attach to other structures, can be hard. I know how waiting is, but that's what has to be done, and deal with whatever it is, and hopefully something minor. Good luck.