Instant hairloss is a combat skill.
The skill is very popular with the ladies, but not nearly appreciated by male heroes. Evil heroes sometimes add bald spots to the heads of other heroes. This causes extreme embarrassment and a loss in health. Monsters who have fur or feathers may be more inclined to hide in a bush if affected during battle.
The hero's target may need to clean out their comb.
The hero's target will notice a vague receding hairline.
The hero's target will notice small spots of their head visible because of not having hair to cover it.
The hero's target will suffer from alopecia.