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Don't think there are any stages. Acne or pimples is due to hormonal changes ,bad diet and unhealthy skin care habits .There are many cheap and effective home remedies for acne. Tomato slices, turmeric, papaya juices and home made packs will treat existing pimples and prevent further problems. More remedies at the link provided.

Source(s):
http://tinyurl.com/ypzvgd