i moved into an old home three months ago. since then a have been getting itchy red bites that don t go away. the itching is horrible. i did some cleaning upon the garden a few times. they first appeared on my hip area, forearms, neck and shoulders. in the past three weeks, more have appeared on my legs, behind my knee s and in the fold of one arm. we do not have any pets and no-one else in the house is being bitten . we live in vancouver canada. what could this be??