Hope this helps:
Acne in women
Women are more likely to have adult acne than men. It's thought that many cases of adult acne are caused by the changes in hormone levels that many women have at certain times.
These times include:
periods – some women have a flare-up of acne just before their period
pregnancy – many women have symptoms of acne at this time, usually during the first 3 months of their pregnancy
polycystic ovary syndrome – a common condition that can cause acne, weight gain and the formation of small cysts inside the ovary
Other triggers
Other possible triggers of an acne flare-up include:
some cosmetic products – however, this is less common as most products are now tested, so they do not cause spots (non-comedogenic)
certain medications – such as steroid medicines, lithium (used to treat depression and bipolar disorder) and some drugs used to treat epilepsy
regularly wearing items that place pressure on an affected area of skin, such as a headband or backpack
smoking – which can contribute to acne in older people.
As for treatment I would ask the chemist regarding a skin wash - Boots the Chemist are very goo when it comes advice.
Best Wishes.