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Wart on foot since March, home treatment without success. Nitrogen treatment at a Doctor's. Could there be any effects? Swelling around, pain?

Yes, there can be side effects from a treatment with nitrogen for a wart on the foot, such as swelling and increased sensitivity. These symptoms usually subside within 5 to 7 days after the treatment, unless there is continued pressure on the wart. It is recommended to wait for the swelling to go down before trying another treatment.