Swelling around my lips, outside of mouth.?

Cold sores. If you did not injure yourself, you probably have a cold sore, aka herpes labialis.
A few things. More information is needed. How long was the swelling present for? Are you allergic to any types of foods or makeup? Did you sustain any trauma or have any cosmetic procedures like (juvederm or restylane). You may have an allergic reaction. See your md.