I think it may be Entomosporium Leaf Spot, a fungal disease caused by Entomosporium maculatum. The symptoms include appearance of circular, small red spots on young leaves. As the disease progress this spots may coalesce to form blotches. The disease is favored by cool and wet weather. Please remove the infected leaves and burn them. Also avoid wetting of leaf surface while watering. Provide proper air circulation around plant.