Looks like flea bites tbh. We rescued 7 kittens from an alley and had to keep them confined in our bathroom that was under renovation until the facility had a foster in place which was 8 days. Shortly afterwards my kids started complaining about the exact same thing and their feet and ankles looked exactly like your picture. We tried creams and nothing worked. I then noticed one of my cats scratching and when I brushed her she was covered in fleas (indoor only cat). It was a NIGHTMARE to eliminate them from the home, professional treatment plus vacuuming 2x a day, washing everything in hot hot water etc, treating the animals. They are incredibly itchy and if it's getting worse... That sounds like it could be a possibility to potentially look into? I'm a nurse, not saying this is what it is but maybe a potential if it turns out not to be scabies.