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are common.almost every adult have few moles.people with light skin have more moles.there can be 40-50 moles on there skin.This is normal.
When moles start to grow,itch and bleed its better to concern a dermatologist.
Most moles dont require a treatment.
If the mole is bothering you and if you find it unattractive, consult a dermatologist
and get it removed.