Two days ago the small painful lump on the right side knap of the neck is now a big hard lump?

Lymph node: Lymph nodes are located throughout the body ; generally noticable in exposed areas like the neck. They are usually pea sized at rest and enlarged when stimulated by bug bites, dermatitis, drainage or infection. They rarely can become damaged by infection ; grow to golf ball size ; need drainage or removal. Most enlarge and later shrink back down within a 3 wk cycle unless chronically stimulated.