Treatment for Acne

We had a fantastic holiday in Europe, visiting lots of countries and sights. The only downside was how terribly cold it was! Almost every country was freezing and winter certainly came early this year with news of snow just before we left! Luckily we had enough winter stuff this trip and managed to keep quite warm. Unfortunately, wrapping myself up in my scarf resulted in some acne spots on my chin which is taking forever to go away! Does anyone know of any good and effective adult acne treatment? One would think I should not be getting anymore acne at this age!