flea or human flea - pulex irritans on a white background.

adult allergy animal arthropod biology bite black blood brown bubonic bug claws clinical close closeup ctenocephalides dermatitis disease entomology fauna flea health healthcare human infection insect invertebrate irritans itch jump macro medical microbiology nature one parasite pest pet plague pulex pulicidae siphonaptera studio transmit veterinary white whitebackground wild zoology