When presented with a bull's-eye rash, why are doctors adopting a "wait and see" attitude?

Troubling blog from NY Times. When presented with a bull's-eye rash, why are doctors adopting a "wait and see" attitude? The writer asks for comments. Let's give her some!

 

Tick Checks, Bug Spray and Antibiotics: Summer in the Age of Lyme

parenting.blogs.nytimes.com