Acne can be triggered by various factors including:

1. Hormonal changes: Hormonal fluctuations during puberty, menstruation, pregnancy, or conditions like PCOS can trigger acne.
2. Genetics: Acne can run in families, suggesting a genetic predisposition.
3. Overproduction of sebum: Excess oil production can clog pores and lead to acne.
4. Bacteria: The skin bacteria Propionibacterium acnes can contribute to acne.
5. Inflammation: Skin inflammation can worsen acne.
6. Diet: Certain foods like high-glycemic foods or dairy products may trigger acne in some individuals.
7. Stress: Stress can worsen acne by increasing inflammation and oil production.
8. Medications: Some medications can cause acne as a side effect.
9. Skincare products: Certain products may clog pores or irritate the skin, leading to acne.

It’s important to consult a dermatologist for personalized advice and treatment options tailored to your specific skin type and condition.