Celebrate Redwood Cityâs History In May, Itâs National Historic Preservation Month! (blog) Earth Month Series: Water Pollution Prevention (blog) Robot Delivery Pilot Program Officially Launched in Redwood City (blog)
One possibility is that it is a learned behavior that evolved from kiss feeding, the process by which mothers in some cultures feed their babies by passing masticated food from mouth-to-mouth. However, there are some contemporary indigenous cultures which still practice kiss feeding, but not social or erotic kissing.
Causes of Swollen Lips. 1  Injury â this could be cause by accidentally biting your lower lip, washing or rubbing your lip too hard, a fight, aggressive kissing, accident, etc.  Allergic reactions â this is one of the most common causes of your lower lip swelling.