By inserting a needle within a skin lesion, fluid or pus can be aspirated and sent to the laboratory for examination. The results may indicate a bacterial or fungal skin infection which then determines the course of treatment.
Review Date 11/4/2020
Updated by: Elika Hoss, MD, Senior Associate Consultant, Mayo Clinic, Scottsdale, AZ. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.