Doctor stated rash on child's stomach was strep related, but child tested negative on throat culture even after growing it. is that possible?

Strep : Studies show streptococcal skin infections definitely normally happen independently but children may develop scarlet fever with a sandpaper rash and strawberry tongue after untreated strep throat Streptococci bacteria colonize our skin however may morph to pathogenicity and wreak a diverse swath of pathology in every layer of our skin. https://www.ncbi.nlm.nih.gov/books/NBK333408/