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Depends on the individual, if it is a long term thing from a young age until now, it may be hereditary or dependant on ethnic origin. for example I know that alot of indian/asian people have this. or it may be because you shave or wax your arms. the actuall pimple thing u can see is where hair root grows out of. go see a doctor or dermatoligist they can help you more, again it depends on individual cases but its harmless.

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14y ago

What else can I help you with?