So my biceps and triceps are sore from my back and chest workouts. I did them 2 days in a row. Now its the 3rd day of continuous workouts due to trying to catch up previous week's 'lost' days. This doesn't happen too often though. Should I train or skip them ? Note that if I skip them I will train them next week, so that gives me 2 weeks of on direct arm training.. Sucks lol

my advice to you is if you miss too much in a week do a FULL body workout and that will cover everything and put you in a maintenance mode.. better than training too much in one or two workouts. But just my opinion...because this is what i do. Arms are trained in a back and chest workout as you yourself wrote too.

I used to worry about how I would make up a missed session. These days, I don't even give it a second thought.

No matter what kind of split I'm following, I simply pick up by doing whatever is normally scheduled for the day I resume. I've found that any further changes made by attempting to "catch up" just throw me off, so to speak, on my proceeding training days.

well you know i have missed a weeks training and went back and felt refreshed.. " the pause that refreshes". Of course you should train regular but the body will enjoy a break too. Do not worry just pick up again.