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).
Contact dermatitis is an allergic reaction to something that youâve touched. Health and the beauty products like a shampoo, or jewelry can lead to an allergic reaction. Some materials, like latex, might also lead to sores on scalp. So can outdoor foliage, like the poison ivy or poison oak. You can also have a bad reaction if toxic substances like the battery acid or even bleach touch the scalp.