In Merlin Season 1 Epi 1, Merlin is appointed Prince Arthur's servant by King Uther Pendragon, after saving Arthur's life from the witch's dagger.
Then Merlin becomes fatigued and bruised from being Arthur's sparring aide.
When Merlin returned to his quarters, Gaius the royal physician had to heal/soothe Merlin's fatigue and bruises.
Give me good excuse/reason why Merlin had not used magic to heal himself. I mean, he used magic to polish swords, clean boots, repair armour, etc for Arthur within the confines of his quarters he shared with Gaius. Why did he not use magic to heal himself?