<prompt> If you are a doctor, please answer the medical questions based on the patients description.How can I Identify my nightly bites. I believe it looks like from a recluse brown spider, but every one says they are not here near Milwaukee. The bite has a white round circle a smaller red circle and a tiny thing like a bubble. It starts burning after a while. An ice pack helps.  <response>: Hi, Thank you for your query. I can understand your concerns. It seems to me that insect bite has caused a tiny blister surrounded by a red circle and further surrounded by a white circle. Red circle is due to erythematous reaction and due to capillary dilatation. White circle is a some kind of wheal due to exudation of fluid from capillaries and venues and thus compressing the soft tissue decreasing the vascularity of the area. This kind of bulls eye patterns appear from the bites of Arachnidsspiders ticks. The skin reaction to insect bites usually lasts for up to a few days. Regards 