A small patch of red bumps on the neck, consider the following possibilities: 1, may be papular urticaria, mainly may be the mosquito bite caused by allergic reactions. The possibility of urticaria is relatively high. Urticaria is caused by allergies, infections or internal diseases, and the rash is characterized by occasional disappearance. You can also apply Olopatadine hydrochloride tablets, one in the morning and one in the evening, and treat it with furnace glycolic lotion.