Firstly, you could wait a bit and see what happens, as some chalazia go away on their own within a few weeks or months.

Then there are some home remedies you can try, although it’s important to be very careful and gentle with the delicate eye area:

• Warm compresses:
  Apply a warm compress to your eyelid for 10-15 minutes, several times a day. This can help melt the blocked oil and encourage drainage.
• Gentle massage:
  After applying a warm compress, gently massage your eyelid in the direction of the lashes. This can help express the blocked oil.
• Lid scrubs:
  You can use a special eyelid scrub to help remove debris and keep the glands from clogging again.

For large, well-established or stubborn chalazion, professional treatment is likely to yield the fastest and surest results.