Found these strange bubbles forming under the paint on my wall near the floor. They feel soft to the touch and seem to be getting bigger—is this a reaction to humidity or something worse?

damage and replace insulation.

Ensuring proper ventilation in areas prone to high humidity, such as bathrooms and kitchens, can prevent future bubbling. Consider installing exhaust fans or opening windows to improve air circulation.

Waterproofing measures, such as sealing the exterior of your home, maintaining gutters and downspouts, and applying waterproof coatings to walls, can also help prevent moisture ingress. Regular inspections and maintenance are key to keeping your walls bubble-free.