Sometimes acne can be caused by medication given for other health conditions or by certain contraceptive injections or pills. Some tablets taken by body-builders contain hormones that can trigger acne too.
Diet can influence acne. High glycaemic index (GI) diets (e.g. sugar and sugary foods, white bread, potatoes, white rice etc) have been shown to cause or aggravate acne. Switching to a low GI diet may lead to fewer spots. There is also some evidence that consuming milk and dairy products may trigger acne in some people, but this hasn’t been studied in as much detail yet.
Most acne sufferers have normal hormone levels if tested; however, acne can sometimes be caused by a problem with the hormones. The most common problem with hormones is polycystic ovarian syndrome in females. If you are a woman and develop irregular periods, unusual hair growth or hair loss or other changes to your body, mention this to your doctor in case it is relevant.