The other possibilities are a cyst (usually grows big or small depending on the fluid in it), a neurofibroma (localized harmless swelling in a nerve), lipoma (localized collection
of fat), a swollen lymph node, an
abscess, or folliculitis (hair follicle infection). An abscess can be hot or warm if it is infective due to bacteria and it can be cold without heat if it is a tubercular abscess.