This is worse than Pompeii. The ancient Roman city wasn’t buried under lava, but under ash, rock and boulders. While that is still very deadly, it isn’t nearly as destructive as lava. That’s why we can still experience Pompeii architecture, art and culture. Excavating this road, covered in solidified lava, is extremely difficult and costly. Just go over it, once it’s cooled.
This is true for every antibiotic used on human beings as well. All of them can give you severe skin reactions or you might develop potentially deadly allergies against them. It might be rarer with the ones we use regularly, I don’t know, but it happens.