What’s a common sign of crab lice infestation in males?

A common sign of crab lice infestation, specifically in males, is the presence of brown to grey specks in hair-bearing areas. These specks are the eggs or nits of the crabs and can be seen attached to the hair shafts. Crab lice, also known as pubic lice, are small parasitic insects that primarily infest the coarse hair in the pubic region, but can also inhabit other areas such as the armpits, chest, and beard. The identification of these specks is crucial for diagnosing an infestation, as they provide direct evidence of the lice's presence.

While some other symptoms such as itching or irritation may occur, the visual identification of these nits is a definitive indicator specific to this type of infestation.