What is a small speck of green phlegm?

A small speck of green phlegm typically indicates the presence of mucus that contains dead cells, bacteria, or other debris, often associated with respiratory infections or conditions like bronchitis or sinusitis. The green color usually results from the presence of white blood cells, particularly neutrophils, which are involved in the body's immune response. While occasional green phlegm can be normal, persistent or worsening symptoms should be evaluated by a healthcare professional.