scar
瘢 centers on a mark left after healing: a scar. It refers to the visible remnant of a wound or injury.
瘢 combines 疒 (sickness) with 般, which likely contributes the sound. The character expresses a mark or scar related to illness or injury.
The sickness enclosure 疒 wraps around 般, like a scar that remains after an illness or wound. Picture a visible mark left behind on the body.
For ハン, imagine a scar shaped like a hand: hand -> ハン, and the scar is a permanent mark on the skin.