Adult hormonal shifts are the most likely cause — androgens, cortisol from chronic stress, and conditions like PCOS push sebum production past what your follicles can clear, and the cysts appear on the jawline, chin, and lower cheeks the week before a period. More than 2 in 5 Americans in their 30s deal with acne, so this is common, not anomalous. Birth control changes, perimenopause, dairy intake, and high-glycemic foods all amplify the cycle. See a dermatologist about spironolactone (an androgen blocker), combination oral contraceptives with drospirenone, or topical tretinoin at 0.025% to 0.1%. For active cysts, a microneedle patch like ZitSticka Killa Kit or a cortisone injection flattens individual spots in 24 to 48 hours.