My eyelashes falling out after chalazions.,when will my eyelashes grow back?

Likely, but in time.: There are 3 growth cycles of an eyelash and it can take several months for them to grow back. It is normal for us to shed our eyelashes but they do so in a somewhat staggered pattern so we don't notice it in one certain area. The chalazions can affect the health of the eyelash follicle and make lashes come out earlier or damage further procution. Prevention of chalazions is key here. Good luck!