Reading into what the proctor said, it sounds like they will be reporting it to the CB. They can’t take the risk of not reporting it because it could put their position in jeopardy, especially if another student had noticed and reports it to the CB (I doubt your peers would do this though). I would try to find out as soon as possible if this might mean you’ll be hit with an academic integrity violation mark on your school records, as that might be worse than whatever the CB throws at you.
Again, I am not explicitly saying that you cheated, but with only the evidence at hand, I want to give you a hypothetical train of thought that administrators at the College Board or your school might take that would lead to them thinking you are guilty. Pretend for a second that I am an admin:
Say I’m presented with the evidence that a student had writing on their body, and although it was unclear as to whether or not they looked at it during the test, it is still explicitly against testing rules to have this. I might think that you wrote these notes on your ankles in case you needed to look down and recall a formula that you forgot as a last resort, and the fact that you didn’t look down might just mean you didn’t need to recall a certain formula, and hence didn’t need to make use of these notes. Or, you could have done this as a discrete way to cheat during breaks–rather than take the conventional way of having a notecard in your pocket or a notebook in the bathroom, you wrote on your skin, so if you wanted to check a formula during the break, you could have gone to the bathroom, and look at your ankles to check your notes, or roll up your sleeves on your arms while in a stall to look at the writing there. Hence, that may have been why you wore long sleeves. You still had access to an unauthorized aid during testing, and even if you didn’t need to need to utilize it during the test, that’s still a breach of testing integrity.
If I were to look at it from angles such as these, I’d be hard-pressed to say you are innocent. Your excuse for why these were written on your skin seems really far-fetched, as I have NEVER heard of that study practice, and almost comes off as some sort of detailed alibi you had in case you needed to use these notes and got caught.
Even if the reason as to why the writing got on your skin in the first place is legitimate, I still would have a very, very hard time believing you didn’t notice writing on your ankles from the day prior. Did you not put your shoes and socks on in the morning and notice the writing? Something still doesn’t add up for me.
I understand that this is probably quite a stressful thing you are going through, but to help quell some of this unease, you need to be honest to yourself–was there ANY ounce of you that may have tried to use these notes to cheat if you needed to? Only you know the answer to that. But, from an outsider’s perspective, I might suggest that some of your paranoia you are expressing here is somewhat indicative of some kind of guilt–albeit, I am no psychologist. Even if it’s not explicit guilt, the level of negligence you would have to display to not notice the writing on your ankles from some bizarre study practice is…unusual.
I amend my previous comment. If I had to bet, it’s more likely than not you’ll face some sort of repercussions. Just hope this isn’t reported to colleges.