Fleas
Fleabites can be grouped in lines, or clusters. If you are particularly sensitive to flea bites, they can lead to a condition known as papular urticaria (where lumps, or lesions, form). Bullae (fluid-filled blisters) may also sometimes develop. Cat and dog fleabites often occur below the knee, commonly around the ankles.
check, check and motherfucking check...
:S