They look like what my dog had this summer when she got fleas. Our vet told us to wash the area with mild soap and then apply some Neosporin and also treat the fleas monthly with a topical treatment (I've found Frontline Plus to be the best for us).
I haven't got the slightest idea how to change people, but I still keep a long list of prospective candidates just in case I should ever figure it out.