Sudden acne breakouts can be because of numerous reasons, including hormonal changes or hormonal imbalance, an unhealthy diet including lots of deep fried and junk food, release of cortisol hormones because of excessive stress, excessive production of sebum and much more. 13-Sept-2019
https://www.ndtv.com/health/sudden-acne-breakout-causes-and-tips-for-prevention-2100213#:~:text=Sudden%20acne%20breakouts%20can%20be,of%20sebum%20and%20much%20more.