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These are either mites or fleas. Go to the pet supply store and get some Revolution. This will kill both types of parasites. Frontline and Advantage will only kill fleas - not mites, so use the Revolution. You only have to treat your cat once a month and it will also take care of ear mites and intestinal worms also.
Please let me know if I can help further.
I applied Frontline plus on my mail 10 year old cat