Looks like eczema as I had similar before when moving to live in Asia after living in the drier Australia most of my life. If it’s itchy and scratched, the lumps and itch will spread and become inflamed and itchier without limits. I suggest to put on some oats water (boiled oats with the water separated and kept in fridge cold to apply). It’s natural and healthy for the skin and can contain rashes or itchiness. For the eczema it will subside by itself after body regulates itself with the help of sometimes camomile cream (doc suggests) or my oats water method :) no harm trying!
Looks like bed bugs rash to me but not sure. Maybe it’s the material of the bed that’s why not going away? Not sure tho
looks serious. better go to another PD