A bug bite on or near your lip often causes this type of localized swelling, which typically does not pose a serious health threat.
[livestrong.com]
Yes Swelling of lips, tongue, mouth, or throat No Swelling of lips, tongue, mouth, or throat Did the lips, tongue, mouth, or throat swell quickly?
[northshore.org]
Soap Cold pack or ice Baking soda Cotton balls Oral antihistamine Warning A bug or spider bite, or insect sting distant from your lip that causes generalized swelling of your
[livestrong.com]