On 2 occasions I've had a couple of sore spots and swelling on my inner lips, top and bottom on the same side I normally put my drip tip when vaping. I remember for certain that on the last occasion I'd held my mod upside down trying to clear the gurgle and getting a mouth full of ejuice and I'm pretty sure that happened the first time as well. I normally vape 12 to 18mg nicotine so could this be the cause or just coincidence?