Yes, some ant bites can cause swelling. Whether an ant bite results in swelling depends on the type of ant and whether the person who was bitten is allergic. The most common instance of swelling after an ant bite is known as a local reaction. These types of reactions are characterized by itchiness, redness, and swelling.
If the bite results in the swelling of a larger area of skin, this could be a large local reaction. These types of reactions usually feature swelling and redness that extends approximately 10 cm from the site of the bite, along with more severe symptoms that can persist for up to 10 days.
If the person is allergic to ants, seek immediate medical attention.