<unk>  is a bacterial infection caused by the fastidious Gram-negative streptobacillus Haemophilus ducreyi. This pathogen is highly infectious. It is a disease found primarily in developing countries, most prevalent in low socioeconomic groups, associated with commercial sex workers.<unk> , caused by H. ducreyi has infrequently been associated with cases of Genital Ulcer Disease in the US but has been isolated in up to 10% of genital ulcers diagnosed from STD clinics in Memphis and Chicago. Infection levels are very low in the Western world, typically around one case per two million of the population (Canada, France, Australia, UK and US). Most individuals diagnosed with<unk>  have visited countries or areas where the disease is known to occur frequently, although outbreaks have been observed in association with crack cocaine use and prostitution.<unk>  is a risk factor for contracting HIV, due to their ecological association or shared risk of exposure, and biologically facilitated transmission of one infection by the other. Approximately 10% of people with<unk>  will have a co-infection with syphilis and/or HIV.
Chancroid
Genital herpes
Tinea manuum
Demodicosis
Tinea faciei
Lentigo simplex
Tinea capitis
Melanosis coli