Chancroid is a sexually transmitted disease in which sores with pustules appear on the genitals.
A dermatologist is a doctor who specializes in diseases of the skin, hair, nails and mucous membranes.
The infectologist is a medical specialist and diseases caused by infectious agents such as bacteria, viruses, fungi and parasites.
The urologist is the doctor who specializes in the male and female urinary system and the male reproductive system.
Remember that for the proper selection of health professional that treats chancroid you must consider the nature, severity and symptoms you are presenting.