When you bite your lip, the constant movement, saliva, and natural oral bacteria can irritate the minor wound. This disrupts normal healing and triggers an inflammatory response, turning the cut into a common mouth ulcer. This is harmless and very typical.\n\nTo relieve pain and speed up healing, you can use Topical Anaesthetics: Generic lidocaine or benzocaine gel to numb the pain. Corticosteroid Pastes: Triamcinolone acetonide dental paste to reduce swelling and inflammation. Antiseptic Rinses: Chlorhexidine mouthwash or simple warm salt water to keep the area clean.\n\nAvoid spicy or acidic foods while healing. If an ulcer lasts longer than two weeks, please consult a dentist or doctor.