Teddy Swims Says Coachella Sun Badly Burned Him, Going Back for Stagecoach

Teddy Swims says he had a blast at Coachella ... but, he didn't enjoy his body being blasted by the sun -- telling us he's got a nasty sunburn from back-to-back weekends in the desert. We caught up with Teddy at LAX on Friday ... and, we asked him…