Hi all - had some plastering done recently. Took the walls back to brick. As it’s drying, there are lots of small bumps I can feel on the walls. Do you know what could be causing this? Never seen in before, but then again I’ve only ever had the walls skimmed rather than talking it back to brick and starting again. Plasterer due back today to fix something else, but wanted to check whether this is an issue so we can get this fixed as well. Thanks is advance