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).
ayurvedic oil massage of the scalp image by NiDerLander from Fotolia.com. Small, thick bumps can form on the scalp for a number of reasons but usually are due to a skin condition. The bumps, usually off-white in color, can reach the size of a dime and can be removed by scratching them off with your fingers.