Had pea size submandibular node for 2.5 weeks. no fever, occasional dull ache from ears down to sides of jaw/throat. 10 days on keflex. node shrank to 1/5th its size, still hard to the touch. dull aches sometimes still should i be worried 1 week ltr?

Single node : It sounds like you have a reactive lymph node, to possibly and infection that has responded to the intervention with antibiotics and time. Over the next 6 weeks the area should resolve if not follow up with your doctor to see if there are other lymph nodes in the area or any other complications.

Lymph node : submandibular node s occurs with infections, can reduce in size with antibiotics, then take weeks to months to resolve. More information is needed to properly answer your question. Why were you on the antibiotic? How long have you had the node.