what is causing two different color eyelashes

Having two different colored eyelashes is a unique and quite rare feature. This condition can be caused by several factors:

1. Genetics: The most common reason for having two different colored eyelashes is genetics. Just like hair color, eyelash color can vary based on your genetic makeup. If you have genes for both dark and light hair, it's possible to have eyelashes of two different colors.

2. Waardenburg Syndrome: This is a rare genetic condition that can cause differences in pigmentation of the hair, skin, and eyes. People with Waardenburg Syndrome might have patches of differently colored hair or two different colored eyes, and this can extend to eyelashes as well.

3. Vitiligo: Vitiligo is a condition where the skin loses its pigment cells (melanocytes), leading to discolored patches. This condition can also affect hair color, including eyelashes.

4. Heterochromia: This is a condition that results in different colors in the iris of the eye but can sometimes also affect hair color, including eyelashes.

5. Age-Related Changes: As people age, their hair can turn gray or white, including eyelashes. Sometimes, this change might happen unevenly, resulting in eyelashes of two different colors.

6. Localized Trauma or Injury: In rare cases, a trauma or injury to the eyelash area could affect the pigmentation of the eyelashes.

It's a unique trait and not typically associated with any health concerns. It's always interesting to see the diverse ways in which genetics express themselves in our appearance!