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These blimshes from acne
can be prevented by using frequent washing of face with non comedogenic creams and natural products.If they are pigmented , you can use a bleach.
Do not try to rupture the blimshes as it can leave a darker spot.
If nothing works out , please visit your Cosmetologist as Techniques like Laser
are available to treat the post effects of acne.
For any more information , if needed , feel free to mail me.