Vitiligo is a genetic condition that creates a loss of pigmentation in patches. Hair on these regions may also lose pigment and appear as white. This condition can appear at any age, and the size of the patches varies between individuals. Most commonly these patches can appear on the face, ears, scalp, and limbs. Although considered an autoimmune disorder, genetics do have a role in this condition. The inheritance pattern for this condition is more complex, as it can be passed down from parents to offspring, but that is not a guarantee as vitiligo can happen at any age at random.
This condition is extremely fascinating as it has no effect on the individual other than loss of pigmentation. Studying this condition and find out if there’s a way to prevent this condition lies within the genome potentially.
Link to article: https://medlineplus.gov/genetics/condition/vitiligo/#inheritance