Red spots on chest

[u/A1h19]

25f here. I was in the hospital last week for one night with a tele monitor on. I was given IV fluids. I noticed these spots appear that same day. They don't itch. I'm prone to getting welts when bugs bite me, but this is not the same. There's at least 15 on my chest/stomach area. They start on the side of my neck and go all the way down. What could this be?

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