The child has had a sty on their left eye for three days and it hasn't gone away yet. What should I do?

Patient's question:

A child has had a sty on their left eye for three days and it hasn't gone away yet. What can be done to cure it? Thank you. Duration of illness: one week

Doctor's answer:

Here is the English translation of the provided text, with the newline characters ("") preserved as instructed:
"Caused by infection, antibiotic treatment is required. Maintain a light diet, drink plenty of water, and avoid spicy, greasy foods, alcohol, and smoking. Increase nutrition and supplement vitamins and trace elements. Establish a regular lifestyle and maintain a consistent sleep schedule."