The authors are correct when they state that there is no current laboratory book specifically for the multifacets of dermatology. However, there is a detailed one now in preparation. This compendium of Butterworth and See is an excellent introduction to the subject. It is something you could carry around in your pocket to give you a clue as to where to look. It provides no critical evaluation or significant interpretation.
For the pediatrician, it may be necessary to add that in many states a brown spider is also found in addition to the black widow, and this spider can produce necrotic lesions in the child. Cutaneous congo-red tests may produce discoloration in children not only from local injection but also from intravenous use in cutaneous amyloidosis. Generalized herpetic dermatitis in children, the so-called Kaposi's varicelliform dermatitis, is associated usually with herpes simplex virus, whereas the coxsackievirus is found in herpangina.