This year I've been getting it where my pack sits/the hip belt sits after a couple days of backpacking. I've had it happen on a couple of different trips.

I've found that acne cream helps though it's not natural.

For a natural treatment I'd try tea tree oil - I used that on zits when I was a teenager and it's pretty good.

I bought some lactic acid 40% and use it once a week. It is less likely to irritate then glycolic and really seems to keep my pors free and clear. I ran out and only realized how much it was helping after I stopped using it! Also keeps my skin nice and soft : )

Another vote for Tea Tree oil. I love it. It works well for me. Another suggestion, on the larger bumps that are sore, put on a dot of tea tree oil and then cover the spot with a bandaid. This works especially well overnight. Covering with a bandaide helps the tea tree oil penetrate and help the pimples heal faster.

You might also consider a body wash with at least 2% salicylic acid. That will also help keep your pores clean. (I like Neutrogena's).

if you can't shower right after you run, at least get out of your sweatie clothes and consider getting some Witchel Hazel to rub over any areas that break out.

x2 on Neutrogena's stuff - I use the orange scented face scrub

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maybe she's born with it, maybe it's chlorine
If you're injured and need some sympathy, PM me and I'm very happy to write back.
disclaimer: PhD not MD

Thanks for the tips. I'm familiar with the tea tree oil, but never used it for this 'problem'. Bought some tea tree oil bodywash, lotion and pure oil. Will let you guys know in a few weeks if the TT-treatment helped.

Happy training and racing!