Eyelid cysts, also known as chalazia or styes, are small, painless lumps that can form on the eyelids. They occur when the oil glands in the eyelids become blocked, leading to swelling. These cysts can vary in size and may cause mild discomfort, but they are generally harmless and often resolve on their own. Treatment for eyelid cysts may include warm compresses to reduce swelling or, in some cases, medical intervention to drain the cyst. It's important to avoid squeezing or popping the cyst, as this can lead to infection. If symptoms persist, consulting an eye care professional is recommended.