The Administer First Aid skill has the text:
perform first aid on an adjacent creature
Which seems to imply that you can’t use this skill on yourself, as the target must be another creature, but I just wanted to double check.
Can you use the Administer First Aid skill on yourself?
While adjacency isn't defined, other text shows that you are not considered adjacent to yourself. Specifically, looking at the related Battle Medicine skill feat (p258)
You can patch up yourself or an adjacent ally, even in combat...'
You can see the methodology is that "you" and "an adjacent ally" are two different valid targets for the Battle Medicine ability. If an ability can target you, it says so specifically. You're not even considered your own ally (as was the case in 1e), for the purposes of targeting.
No.
You must perform it on an adjacent creature as per the quoted ability text. You are not considered to be adjacent to yourself.
