Going to Mexico in one month, with some help to use . [going to mexico] [tazorac]

Im going to Mexico in one month, but I take acne medication and will probably need help from you about what to use. My face is 99% clear (I get a pimple every now and then) but my chest and back are still problems. They feel pretty smooth, but not so good, because the red marks are so prevalent.

Here s what I am:

Tazorac 0.1% cream, night: 7 days a week, morning: 3-4 days / week (so every other morning)
Trimrepthopen (twice daily) – a species similar to Bactrum

Now pill, my face is clear in theory as I said – its almost even clear red flags. However, my chest pretty bad red spots and a lot of white bumps (my derm says they are scars). So, is there a way I can cover them up or abolish Mexico before? All treatments? I want to look decent with my shirt off (Im a guy) lol. Or is there a chance that the sun would mix them when I get a tan?

My other question is, how much sunscreen should I use and how often?

Thanks.

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