Some people, and I am one of them, have pores that close over especially when they are working hard, like exercising more often. I have permanently closed ones on my arms, and have just started noticing them on my chest. My doctor was so excited when she saw the ones on my arms, the condition has some fancy latin name, and it was the first time she had really seen it!
As well as 2frustrated's excellent suggestions, try using a gentle exfoliator, it may not get rid of them but it will reduce their appearance. It needs to be a really gentle cream, and avoid anything with walnut shells in it, it will make your skin even more red.
And drink heaps of water before after and during exercise to keep your skin working nicely.
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