I missed how many miles you have on the engine, but that minor seep I wouldn't even bother with it.
Take some engine cleaner / degreaser / Brake clean / WD-40 and scrub with a small brush, then hose off gently on a cold engine.
Until it starts dripping and affecting oil level I wouldn't worry about it. That could be years, or never at that rate. These engines are 15 years old. They are known for valve cover seepage. Not a big deal. A little oil can make it dirty or dusty engine look like a big leak. That's a tiny seepage.