Can a fever blister cause a swollen lymph note under chin?

Not cause, but. They could be related in some way. The virus that expresses itself as a fever blister can prompt your lymph node to work hard to attack the intrusion (usually an infection) and the effort can cause the node to harden and/or enlarge a bit. Also, it can be two separate problems. In any case, an exam may be wise to treat either or both. Feel better soon!

Related Questions

Lymph nodes under chin/in throat swollen and really hurting/ache. Getting pain up into my ears. No fever. What causes this? What can I do to feel better?

Get examined. Submandibular or cervical lymphadenopathy occur in upper respiratory infections and do not usually require intervention. But large lymph nodes can also occur in HIV and lymphomas. Read more...