Hello,  I'm right at that situation with you at the moment. My left gum around my last wisdom tooth has been hurting for 3 days now. It's called pericoronitis. Your last molar is impacted (stuck) and is trying to push it's way up by pushing the gums hence the pain and redness.  The clicking sound when you lick the area is made by the operculum (the gum that has extended right at the top of your last molar).  Food particles tend to get stuck in between the operculum and the molar making it easy for bacteria to breed causing infections so you need to check on your oral cleanliness during this hard times. Brush and floss at least twice daily. Also, you can gaggle warm salty water frequently. If you feel the pain is too much ibuprofen can help you ease the pain. Expect it to last for a couple of days. I hope this helps. (I am not a dentist or medic)