Why will there be swelling after bark is removed from a plant?

Swelling after bark removal occurs due to the plant's response to injury and the exposure of underlying tissues. When the bark is removed, it disrupts the flow of nutrients and water, causing localized accumulation of fluids and tissues to swell as the plant attempts to heal. Additionally, the damaged area may trigger the production of protective substances and callus tissue, contributing to the swelling. This response is part of the plant's natural healing process.