Periodically my DC1 comes up in spots which go in a line from her top left buttock, up her side then across her back. Once every 2-3 months or so. They don't appear itchy, have the occasional head and go after a week. She's had chicken pox, we don't have pets (idly wondered if it was fleas for a bit) and no one else in the family gets them.
Any thoughts or experienced similar?