Tasman Ruffles Pittosporum

Purple spots are probably a fungal disease. They're pretty common in wet climates, as they are spread by rain and thrive when leaves are wet. A few spots here and there on some plants aren't an issue, but it is possible for it to get out of hand and start to hurt the plant. Bring a cutting and a picture into your local garden center. They can help you find the appropriate product to use.