Have dozen or so new round spots on trunk,abdomen and legs the size of a pencil eraser. slightly indented reddish brown no pain or itch,smooth. ideas?

See a doctor: Rashes are very different and require a in person evaluation to accurately diagnose and treat.

Most likely bug bite: The sudden appearance of several discrete round red areas only on part of the body suggest some type of bug bite. Different people have different reactions to different biting insects. A poison ivy contact usually is grouped and not round but linear.