First and second instar nymphs feeding. Some bugs are almost full and ready to leave. On the right is a group of 3 nymphs, the one in the center has begun to feed and it is now red (blood shows through its pale skin) and partially full of blood. The light colored raised areas on the left side of the hand have resulted from bed bug feeding within the last hour. These marks will disappear and within a few hours only a red mark pinpointing the bite site will remain. Bite reactions vary from person to person. The red area below the feeding bed bugs is a nevus, a birthmark.
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