thanks for your query,
the knot near the nose or below the eye over the maxillary sinus
could be secondary to a tooth infection
like cyst or fibrosed abscess
or any pathology arising from maxillary sinus..these can cause radiating pain
and swelling in the affected area...crystal coming from gums is strange...consult a oral physician and ENT surgeon as early as possible..you need to take radiographs like OPG and PNS view to rule out any pathology...i hope my answer will help you..
Dr. Mahesh Kumar T.S