Months-long chin breakouts almost always signal hormonal acne, since the lower third of the face has the highest density of androgen-sensitive sebaceous glands. The cycle: androgens drive sebum production, the pore plugs, Cutibacterium acnes proliferates, the cyst forms deep enough that topical treatments cannot reach it. PCOS accounts for roughly 10-30% of persistent jawline acne in women and warrants a hormone panel. The standard dermatologist fix is oral spironolactone 50-100 mg daily (androgen blocker), topical tretinoin 0.025-0.05% nightly, and drospirenone-based birth control (Yaz, Yasmin) where appropriate — visible results in 8-12 weeks. Patches and topicals fail here because the lesions sit too deep. Skip whey protein, which worsens jawline acne via IGF-1.