Itching is normal when you’ve been bitten or licked by an insect. But if after 24 hours the site becomes increasingly tender, you may be suffering from an infection or allergy. Wash the area with water and liberally apply an over-the-counter antibiotic ointment or powder such as Neosporin. If it doesn’t heal within a day or two, visit a dermatologist. Most infections come from scratching that breaks the skin and leaves it open to contamination. Allergies multiply on open wounds. Cover with a bandage.

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