Toothpaste On Lip Pimple. Over-the-counter benzoyl peroxide and salicylic acid work great to clear acne -- and help prevent it as well. To get rid of a pimple using toothpaste start by washing your face with warm water and a gentle face cleanser.

I do not believe the toothpaste had anything to do with inflaming the pimple. The application is straight forward just applying the oil on the pimple. I cannot imagine why you would put toothpaste on a pimple.
Go for white-colored toothpaste.
Many unfortunate souls have developed a chemical burn or a nasty rash called contact dermatitis after applying toothpaste to a zit. Hot or cold compress. Reach out for this kitchen ingredient when you have a pimple on the lip. Try other options if you can.