Those days taught me that unfamiliar spaces can leave marks long after you’ve gone. Old apartments often carry invisible histories: bed bugs tucked in mattress seams, fleas in worn carpets, dust mites in pillows, mold spores in the walls, or chemical residues soaked into fabric. You don’t see them—but your skin does, especially at night, when you’re still and unprotected.

I learned to pay attention instead of brushing it off. To check mattresses and headboards, look for dark specks or tiny shells, wash every piece of clothing the moment I got home, and shower as if I were rinsing off the place itself. The bumps eventually faded, but the lesson didn’t. When your skin starts speaking in welts, lines, and clusters, it isn’t just irritation. It’s a warning that the room around you may not be as harmless as it looks.