You know your situation best of course but unless you have a history of failed attempts or told someone of your plans I don't see why someone would call you out.
Nonetheless, besides makeup for covering it up high collar (leave it unbuttoned) + something hung from your neck (mask, headphones etc) could work (don't do this if you're going for makeup, would just draw attention). I would've suggested a neck brace or possibly a cream but if you think you'd get called out because of clothing, you'd definitely get called out for those (although if you do sports the brace could very well work).
Is avoiding people not an option?