In adolescents there is an increased activity of the sweat and oil glands....the skin becomes oilier ,,,often causing acne and pimples on the face ...........
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at puberty,the sebaceous glands either swell or get inflamed due to increasing activity of sweat glands,causing acne In case oil accumulates in them and there is bacterial growth pimples occur

As individuals enter puberty , there is an increased activity of facial sweat and oil glands due to which acne, pimple occur on the face.