One of the main causes of sinus drainage is simply being alive. Every day the human body produces several liters of sinus fluid and mucus, and all of that natural liquid must go somewhere.
It is a area of tenderness of the scalp in which people also sometimes feel stabbing headaches. Others just feel very sore and tender to the touch. It is felt to be caused by irritation of the connective tissue which attaches the muscles of the scalp to the skull (cranium).
There are many different things that cause scalp tingling, which is also commonly referred to as paresthesia. In many cases, a tingling scalp is a side effect of other problems, such as a migraine headache or an allergy to a specific product used on the scalp.