Insect and Spider Identification: Bug bite?, 1 by Mdell

Mdell wrote:
Was bit by a bug about 2 months ago while taking my dog outside. Not your normal mosquito bite as this actually felt like a sharp little pinch. I swatted at the area but never saw a bug/spider/tick. However just a few weeks ago this \"bullseye\" rash popped up on the same spot behind my knee. I had bloodwork done for lymes disease which came back negative today. Any idea what bug may leave a similar bite mark? Picture not the greatest but it\'s looked a lot more defined the past few weeks