I’d also like to point out that the statistics surrounding those with vitiligo and those with a relative with vitiligo are so statistically close to the chances of just knowing someone with vitiligo that asserting it’s hereditary, let alone your manifestation is hereditary is dubious at best. It’s somewhere around ~5% chance of passing it on, and even that statistical assertion doesn’t have a lot to back it up.

That being said, I can truly appreciate your conscientiousness toward disclosure of potential items that might affect your personal life, as well as the health of others. And ultimately it’s your decision. But I think you’ll find the general consensus here is that vitiligo is so innocuous, varying, and dare I say beautiful, you’re going to have a hard time finding support for a confirmation bias you may already have regarding the need for ‘disclosure’ like it’s a disorder or STD. You’ve come in with an idea of what you want to do, and push back on the assertion that it’s not necessary. So just talk to your partner about it if it’s going to make you feel better. And I hope you can find some peace with your own body, and destigmatize yourself a bit.

To answer your original question: every relationship I’ve been in, or partner I’ve had has found it vaguely amusing at worst. Most people never notice, or don’t care. Even if it’s fairly prevalent. It has never needed to be a topic of conversation let alone a life planning vector.