"Here, hold still a bit," Seamus said gently, taking his wand out. "I'm actually pretty good wi' healing bruises. Not wi' much of anything else, mind, but bruises are a specialty o' mine."
That was largely due to his seventh year of school. The year of the Carrows' authority over Hogwarts had been a brutal one for Seamus and his friends. Most of them had taken bad beatings, and as a result lots of them had gotten proficient at healing the bruises which could be healed. What Alicia had was just a physical injury, and easy enough to handle with magic - magically caused bruises, on the other hand, could be tricky.