A welt is formed on the finger due to excessive force generated on it.
A welt is a lump of dead skin formed in that area. It is also known as a callus. When a person sharpens the pencil too many times, pressure and friction are generated on the skin of the fingers because of the pencils rubbing against the fingers. So as to protect the skin underneath which is very sensitive this dead mass is collected on the fingers as a welt.
They are the body’s way to protect itself naturally so they are not dangerous or harmful. They get healed by themselves automatically.
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