In most cases Minoxidil is applied directly to the scalp twice a day. Your scalp should be dry at the time of application and you’ll be advised to leave it in place for anywhere from 2 to 4 hours after application and before shampooing it out. It is while the product is drying and soaking into the scalp that irritation (if any) typically occurs. Some Minoxidil products come in the form of a foam which you spray onto the affected area and then work in with your fingers. Other Minoxidil products take the form of a liquid that is applied using an eye-dropper type applicator and then gently massaged into the scalp. In order to ensure you don’t experience unwanted hair growth in other regions make sure you wash your hands thoroughly after applying any Minoxidil product.\r