What Causes Blueness Around The Mouth?

hi my 2 and a half year old son has been having episodes where he turns blue around his mouth it usally happens when he wakes up and at random times throughout the day on a daily bases, it is unrelated to temperature there is a history of heart disease in our family ( high cholesterol, high blood pressure in both sides grandparents, his father has an arrythmia, his grandmother and sister both have an asd his sister also has a pda) do you think his blue spells could be heart related.