so Dr Google tells me they're known as higad there in the Philippines, not sure if that is a generic term for all stinging caterpillars or a specific type. I found an old school announcement explaining what to do if you have a reaction to them which you might find useful.
https://2012.ateneo.edu/high-school/news/features/skin-irritation-caterpillar/higad-bristles
So I live in Brazil, where we also have various types of similar stinging caterpillars. Some of them can cause liver failure and people have died, but it's generally where there are large clusters of them someone (usually an orchard worker) has fallen into. It is a fact of life of living here in my region, but I don't really worry other than taking some basic precautions.
They move, obviously, because the moths fly around. So where you see some this season, you may not see them next season. When people move here they learn very quickly to stay on paths, be careful climbing
trees, and not brush through leaves and vines. I always wear long sleeves and preferably gloves and a neck kerchief when working in the garden, that is the best way to avoid problems. If I find some of the really bad ones I will try to remove them from high traffic areas where someone is like to brush against them, but I don't worry, there really isn't much I can do about them because they're everywhere. the birds seem to enjoy eating them and i make sure to attract lots of birds into my
yard.
The moths that these caterpillars turn into, at least here, also have itch-causing properties, so be careful picking them up!