Other STIs

A person with lesions on their abdomen from scabies

Scabies

Scabies is an infestation of the top layer of skin caused by the parasite. Scabies are passed on through close physical contact. Transmission is more likely when partners spend the night together than during a brief sexual encounter.
A sample is viewed under a microscope

Molluscum Contagiosum

Molluscum contagiosum is a skin disease caused by the molluscum contagiosum virus (MCV) Once a disease primarily of children, molluscum has evolved to become a sexually transmitted infection in adults.
Mgen

MGen: The STI You’ve (Probably) Never Heard Of

Mycoplasma genitalium, or Mgen, was first identified in 1981. It is a bacterium that can infect the reproductive tract and is passed on through sexual contact.
Pubic lice or crabs

Crabs (a.k.a. Pubic Lice) usually don’t cause anything more than discomfort and inconvenience

Pubic lice, also known as crabs, are small parasites that are usually found on the pubic hair. Symptoms of crabs can be bothersome, but in general crabs don't cause anything more than discomfort and inconvenience.
NGU

NGU, or Nongonoccocal Urethritis

Nongonococcal urethritis—or NGU—is an infection of the urethra caused by germs other than gonorrhea. The most common cause is chlamydia.