Dermatology - Macule

Dermatology - Macule 
The term "macule" is derived from the Latin word for "spot." A skin eruption characterized by flat, discolored patches is referred to as a macular exanthem.

A macule is a defined region on the skin that exhibits a shift in color without any raised or sunken areas.Macules are characterized by their flat nature and lack of palpability.
Macules might have distinct boundaries (sharply defined) or spread out. • Macules can vary in size or color. Macules can have pigmentation in shades of brown, black, or blue, or they might be skin-colored (amelanotic) or red.

Diagnosis 
Diascopy, which involves applying pressure from a glass slide on the edge of a red macule, allows for the detection of red blood cells. If the redness persists when pressure is applied to the slide, the lesion is classified as purpuric, indicating that it is caused by the leakage of red blood cells. Conversely, if the redness vanishes, the lesion is attributed to vascular dilation.