A whitehead is formed in the same way, but the pore remains closed. The white pus is caused by dead white blood cells that have been fighting the bacteria as a result of the immune response to the chemicals they have emitted. It is not so much the bacteria themselves that cause the problem as the toxins that they produce.
A quarter of male acne sufferers and half of female acne sufferers are adults. Most had the condition in their teens but many had clear skin all through their teens and only developed acne in their twenties, thirties and even forties.
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