Large congenital nevi form in the womb very early in development, within the first twelve weeks of pregnancy. They are caused by a defect during embryologic development. There is no known method of prevention. They appear in either sex, in all races, and on any areas of the skin.
I recommend that you have a carbon monoxide detector within 15 feet of each bedroom door, 10 feet is even better if you can afford more detectors. If two bedroom doors are 30 feet apart or less, then place one in the middle. If however they are more than 30 feet apart you will need more than one detector.
If there are no CO detector regulations in your area and the property you're living in relies on the combustion of fossil fuels for heating, ventilation, hot water, cooking, or for any other purpose, install a Carbon Monoxide detector as soon as possible.arbon Monoxide detector locations: http://www.checkthishouse.com/4822/wh... In this video I'd like to show you where to install Carbon Monoxide detectors in your home. Just to cover Carbon Monoxide basics;