If someone you like kisses your neck, it itches. If you don't like it, it doesn't itch.

1, skin allergy: when the neck is kissed red, the skin capillaries may be seriously dilated due to the strength of the kiss, which may lead to congestion and itching. Need to see a doctor in time, apply calamine lotion to relieve skin itching according to the doctor's advice, and use loratadine and other drugs for antiallergic treatment when necessary;

2. Stimulation of saliva to skin: Saliva can stimulate the skin to some extent, but it does not rule out the fragility of patients' skin. Usually you need to exercise, improve your diet and nutrition, and improve your immunity.