I have a lump behind my ear thats a pea size. i have not been sick. should i be worried? or get it checked out?

Probably nothing: The most common cause is a postauricular lymph node which may have been there for ages without you knowing. If you recently had scalp irritation it could flare up and get bigger. The other common consideration is a dermoid cyst, which is benign. If it isn't growing or you don't find other new nodes around it, it likely can wait to discuss with your primary doctor at your next check up.