Which skin lesions do not cast a shadow?

Flat lesions do not cast a shadow because they are at the same level as the surrounding skin. This means that when light is shone on the skin, these lesions do not create a distinct outline or shadow; they blend in with their surroundings due to their flatness. Examples of flat lesions include freckles, moles, and patches, which lay evenly on the skin surface.

In contrast, elevated lesions protrude above the skin surface and can cast a shadow when illuminated, creating a noticeable distinction from the surrounding skin. Depressed lesions, on the other hand, are below the level of the skin and could potentially create a subtle shadow due to their indentation. Fissured lesions, characterized by splits or cracks in the skin, also may create some shadow depending on their depth and angle.