3-4 days back i found a swollen/firm lymph node on my SCM muscle, it's as small as a lemon seed. I got it checked by an ENT, he said its reactive lymph node which is due to your buccal mucosa ulcer(probably due to wisdom tooth, which i am going to get extracted this week as my dentist suggested), but my issue is when i press it or palpate it i get cough after few seconds, and sometimes theres very very dull ache when i touch it(goes away if i touch it multiple times).. M i having any infection?