is there actually a bump on the lower lid? if so, how long has it been there?
Sometimes, chalazia present a bit more indolently. They are simply blocked oil glands in the eyelid. Sometimes, they can even have an internal protruding componenet that causes lots of surface irriatation and pressure sensation. The injection you are to have is a steroid injection and really is "no big deal". I do them all the time and they often help due to their anti-inflammatory nature in the lid. I suggest vigourous heat packs if there actually is a red "anything" in the lid as it can help reduce the size of red (inflamed) tissues. Make sure to use a soothing lubricant to reduce the redness on the eye, refresh Celluvisc is a wonderful tear to use. I wish you best luck, Dr Stevens