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In page Combined oral contraceptive pill:
"Studies have shown that combined oral contraceptives are effective in reducing both inflammatory and non-inflammatory facial acne lesions.[8] However, comparisons between different combined oral contraceptives have not been studied to understand if any brand is superior than the others.[8] Oestrogen decreases sebum production by shrinking the sebaceous gland, increasing Sex hormone-binding globulin (SHBG) production to reduce unbound testosterone, and regulating LH and FSH levels.[9] Studies have not shown that POPs are effective against acne lesions.[citation needed]
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