In general terms, this is usually called fly strike dermatitis. (okcpetsmagazine.com)
This summer, while travelling, one of our dogs suffered from fly strike on its back after an attack of diarrhea. (happytailsspa-blog.com)
In order to differentiate between fly strike and these other diseases, an ear exam, skin scraping, bacterial or fungal culture, or a skin biopsy may be required. (happytailsspa-blog.com)