A stye can grow on the inside or outside of the lid, which are commonly caused by the blocking of an oil gland at the base of the eyelash. Causes are poor nutrition, sleep deprivation, lack of hygiene, lack of water, and rubbing of the eyes. Symptoms are pain, redness, swelling and tenderness. Mascara is also cause of stue. Mascara can easily lead to infect on eyes. The cosmetic substances are easy to cause chemical reflection. At this time, the best thing you can do is to hold consult with an oculist and take some notes from him/her. And you should pay attention to your personal hygiene. That is, washing your hands before eating anything. Don't rub your eyes with hands, or further infection may occur. Plus, eye stye is really so terrible in that it affects your outlook so much.