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.
Causes of Condensation. One of the main causes for condensation on air conditioning ductwork is when the outside of ductwork is cooled down and makes contact with warmer, more humid outside air. This is common especially in attics and crawl spaces, which can very easily reach high temperatures during the summer.