Herpes at the root of pubic hair has turned into black dots may be caused by factors such as crusting or post-inflammatory hyperpigmentation. 1. scabs: herpes lesions at the root of pubic hair are mainly manifested as small blisters, vesicles or shallow ulcers are formed after the blisters break, and finally scabs are gradually formed, and the color gradually changes from dark red to black. 2. Post-inflammatory hyperpigmentation: herpes invades the human body, it will replicate in the skin cells, causing local inflammation, after the inflammation subsides, it is possible to cause hyperpigmentation, appearing black dots. The appearance of herpes at the root of pubic hair should be timely to the hospital, a clear diagnosis, the specific circumstances need to consult a dermatologist.