Possibly your lymph nodes? If you were sick few weeks prior or are about to get sick, your body fighting any type of virus or bacteria, infection they will swell. Definitely worth checking out. Best wishes hun
I get that sometimes but its unfortunately a huge white head. But it could be nothing like Caroline said
Same thing happened to me, it went away. My doctor said its nothing to worry about unless it keeps coming back. I wouldn't stress it, but definitely tell your doctor about it.