Spark plug keeps.literally burning itself.out fast

So my car has been burning up the spark plug really fast lately. I have no clue and wanted suggestions. The spark plug is the one nearest the coolant hose on the left side. The xlilpack had been chamged not.to.long ago..Now before it got to this point I've been doctor on my car for a sec. I dropped something into spark plug hole and had to seafoam spray it out. My last oil change messed me up because I was informed it was heavier oil added.. I'll add a pic if asked.