My friend has a 2 inch long hard painful lump directly on her collarbone. She woke up with it this morning, it is warm and painful to the touch, redness and swelling over the 2 inch long area, no surrounding swelling of tissue , no itching associated with the lump. It almost looks like something could be under the skin, but she stated it is not a burn and not a suspected insect bite due to no itching/burning sensation, and no surrounding redness and swelling. Could it be something related to an infection regarding cellulitis? Thank you very much for any advice.