I also get these bumps and have a lot of friends with the same problem. The only thing you can really do is exfoliate with a loufa or scrub and use a good moisturizer after showering. Tanning also helps but I don't recommend it since sun damage causes 90% of visible aging!
The humidity and sweat is most likely causing some inflammation of the folicle. Exfoliation with a product with glycolic, lactic or salicylic acid a couple of times a week should help. Follow with a good moisturizer (shea butter is great!). If it persits or gets worse, see your doctor!
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