👉 In dermatology, a lepto-dermous is a type of skin lesion that can occur in the skin. It is characterized by the presence of small, round, and often painful bumps or sores on the surface of the skin. These lesions are usually caused by an infection called syphilis, which is an infection of the skin and mucous membranes caused by the bacterium Treponema pallidum. Lepto-dermous can be caused by various factors such as contact with