I have a ton of these things. I used to think they were inflamed and knotted muscles, but my massage therapist tells me otherwise. I have a hard time telling which lumps are lipomas and which ones are myofascial trigger points, especially since most of them are in my back, so I'm not sure if any of mine are painful.
Humidity. The most common cause of condensation on double-glazed windows is humidity. The outside window is colder than the inside window causing fog or frost to build up in-between the two panes. The window and house is extremely airtight and cannot breath.
Changing from single glazed windows to double glazing with standard aluminium frames may not get rid of condensation problems. Aluminium is a good conductor of heat. On very cold days, the inside of the frame can be almost as cold as the outside, and moist air inside the house then condenses on the frames and runs down. Thermally-broken aluminium frames have a spacer with a higher level of thermal performance between the inner and outer parts of the metal frame.