I have a lump near my rectum that is deep underneath the skin. It has been there for quite some time now, more than six months, and I've never thought anything of it. However, recently it seems larger and closer to the surface of the skin. Today, it touched it and noticed that it had a pink, watery discharge coming out of it. So, I squeezed it, and had a tissue full of this discharge. Should I be concerned? What might this be?