I Have Itchy "spots" On The Trunk Of My Body.

I have itchy "spots" on the trunk of my body. They look like flea bites. Have had an exterminator at house to check for bugs etc---have washed all underwear and disinfected the drawers they are kept in----They are pink round circles with a pimple looking center. They last for a week or so ,then disappear. They aren't in clusters but appear here and there on my body. Am using a cortisone cream to alleviate the itching.