What Causes Recurring Red Rashes On The Scalp, Arms And Chest?

I have had recurring rashes, lasting for a week or so. They are red, not raised and have small scabs. They are particularly annoying on my scalp, but have appeared on my arms, my hands, my wrists and my chest. Creams prescribed by the doctor have done little to alleviate the symptoms. They first arrived soon after my return form Myanmar. I remember feeling physically low at the time but did not have a high fever. During investigations, the GP found a Keratoacanthoma, this was removed. Should I be concerned about scrub typhus? Could the Keratoacanthoma have been the eschar? The initial rash was nine months ago, but the most recent was last week. Thank you