Should I put sun block on my scar under my bathing suit?

I'm going to Hawaii next week and was wondering if anyone knows if I should use a sun block on my scar under my bathing suit? I don't want my scar to darken through my suit, if it can. I don't know that I want to drape a towel over my belly while I'm lying in the sun. (I tried looking through the library but only came up with tanning booths.) Any info is appreciated. Thanks! :o)

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