No it’s not like flea dirt it’s like dry blood I don’t know how to explain but it’s not small black dots .. i have flea treatment i can put for her but im not sure what is itThat actually looks very like flea dirt...which is dried blood. Is she on a good flea preventative? And do be aware that sometimes fleas can become immune to a preventative after a while!
Unless you are seeing fresh blood from an injury, I wouldn't fret TOO much over it. Check for those fleas, and keep an eye on things. If it gets worse/spreads, then a visit with the vet is in order. However, this isn't a life-threatening situation. That said, I KNOW how we get about our cats!