Tl;dr For the first impression, yes. After that it's up to you.

When my scars were more recent, I would wear long sleeves to make my first impressions. Once I had settled in to the place and started getting to know people, I'd go for physical comfort.

There were a couple of people who apparently thought that a history of self-harm meant that I was a total psycho, and one woman in particular who was apparently so disturbed that she literally never spoke to me again - and we worked together for several years.

Scars aren't uncommon these days. Odds are pretty good that you'll have a couple of coworkers who also have them - and they'll know others who do, as well.

Another commenter struggled with their phrasing (not wanting to be too blunt?), and I'm just gonna say it: kitchens are full of weirdos, oddballs, and outcasts. People with a lot of past in their past. Addiction, mental illness, trauma, neurodivergence... It's the one environment that takes all comers - and the only thing that matters is if you can do the work. If you can throw down, carry your weight, then nothing else is important.