Men with small worms found in the perineum can be considered as pubic lice or pinworms. 1. pubic lice: pubic lice for sexually transmitted directly or indirectly transmitted, can be found in the pubic hair attached to grayish-white gravel-like particles of lice eggs and slow-moving pubic lice, in the night appeared intense itching, scratching can be scratched and scabs, can be found in the underpants of pubic lice blood sucking blood left behind the blood stains of the spots. 2. Pinworms: pinworms are common in early childhood, during sleep, female worms crawl out of the anus to ovulate, causing nighttime itching in the perineum and near the anus, pinworms patients as a source of infection, through the fecal-oral route of transmission, which can make the patient’s sleep disturbed, night terrors. When you find small worms in and around the perineum, seek medical attention to clarify the type of worms and treat them.