Infections, diseases, ticks

Hard ulcer: what are its causes (non-infectious + infectious)

Hard ulcer: what are its causes (non-infectious + infectious)

This symptom is the main sign of a sexually transmitted disease, namely syphilis. However, it is not only transmitted during sexual intercourse. It is transmitted through bodily fluids and therefore also during kissing. Another non-infectious cause of a skin ulcer is a blockage of the duct of the sweat or sebaceous gland.