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?

the wall where the bubbles are present. Leave it for 24 hours, then check for condensation. If moisture is present on the wall side of the foil, it indicates a problem within the wall.

Additionally, inspect nearby plumbing fixtures for leaks and check your roof and gutters for signs of water ingress. Using a moisture meter to check the wall’s moisture content can also provide valuable insights.

First, reduce humidity levels in the room by using a dehumidifier or increasing ventilation. If you suspect a leak, turn off the water supply to the affected area and contact a plumber. For rising damp, consider installing a damp-proof course to prevent further moisture ingress.

Temporarily remove the bubbling paint to allow the wall to dry out. This will prevent further damage and mold growth until permanent repairs can be made.