Whether eyelashes can grow out after being burned depends on the severity of the burn and the damage to the hair follicles:

- Mild Burns: If the burn is mild and only affects the tips of the eyelashes, leaving the hair follicles intact, the eyelashes will usually grow back. The growth rate is similar to the normal growth cycle of eyelashes, which is about 0.12 to 0.14 millimeters per day. It may take a few weeks to a few months to return to their original length.
- Moderate Burns: When the burn is more severe and damages part of the eyelash hair follicles but not all of them, some eyelashes may still be able to grow back, but the growth may be irregular. The damaged follicles may produce thinner or shorter eyelashes, or the growth may be slower. In this case, it may take longer for the eyelashes to reach a relatively normal state, and in some cases, they may not return to their exact pre-burn appearance.
- Severe Burns: If the burn is extremely severe and causes extensive damage to the hair follicles, the eyelashes may not be able to grow back. The heat from the burn can destroy the cells in the hair follicles that are responsible for hair growth, leading to permanent damage. In such situations, medical intervention such as eyelash transplantation may be considered if one wishes to restore the appearance of the eyelashes.
To promote the growth of eyelashes after a burn, it is important to keep the eye area clean and avoid further irritation. If there are signs of infection or other complications, it is necessary to seek medical attention promptly.