gastrointestinal disorders
Pruritus Ani (Anal Itching)
Testing
For many patients, a trial of empiric, nonspecific therapy is appropriate unless particular findings are noted. For example, biopsy, culture, or both of visible lesions of uncertain etiology should be considered. If pinworms, which occur most often in school-aged children, are suspected, Diagnosis by patting the perianal skinfolds with a strip of cellophane tape in the early morning; the tape is placed sticky side down on a glass slide and viewed microscopically. 