Bite on arm resembles cigarette burn!Exterminaters came,found nothing in my home.But soon as it is almost healed seems I get another.Began February 25,had 5 bites between that date and March12.Swollen,did have round red circle,now just swollen and itchy,bit warm too the touch.Im losing my mind searching for a bug I m beginning to think is invisible and invincible since I have sprayed everything in every room.please help! Doctor gave me antibiotics and told it s definitely a bite of some sort....well duh,any help appreciated,thanks