Swollen and itchy lips are considered to be related to various factors such as allergy, labiitis, herpes simplex and so on.
1. Allergy, if you usually eat allergic food or drugs, may cause some irritation to the lip skin, resulting in allergic reactions, so the lip swelling and itching symptoms.
2. Lipitis, if contact with irritating substances, bacteria, viruses or other pathogens invasion may induce lipitis, so it will produce more inflammatory secretions, lip swelling and itching symptoms.
3. Herpes simplex, if invaded by the herpes simplex virus may lead to skin tissue damage, swelling and itching of the lips and other conditions.
Normally, you need to observe the swelling and itching, and if the situation worsens, you need to consult a doctor as soon as possible.