What are the symptoms of stye and chalazion?

Symptoms of a stye at first generally include eyelid tenderness and redness in the affected area, with irritation and scratchiness in the eye. 
Further symptoms of a stye include:

• A red bump along the edge of the eyelid at the base of the eyelashes, usually with a small pus spot in the center;
• A feeling as if something is in your eye;
• Sensitivity to light;
• Crusting along the eyelid margin;
• Tearing.

About 25 percent of chalazia have no symptoms and ill disappear without any treatment. Sometimes, however, a chalazion may become red, swollen and tender. A larger chalazion may also cause blurred vision by distorting the shape of the eye. Occasionally, a chalazion can cause the entire eyelid to swell suddenly.