If a patient presents with purple lesions in the mouth and body, what is the most probable cause?

The presence of purple lesions in both the mouth and body is highly indicative of Kaposi Sarcoma. This condition is a type of cancer that arises from the endothelial cells that line blood vessels, leading to abnormal proliferation and resulting in the characteristic lesions. Kaposi Sarcoma is often associated with immunocompromised states, most notably in patients with HIV/AIDS, making the identification of these lesions particularly important in clinical practice.

In contrast, Sturge-Weber Syndrome typically presents with facial port-wine stains and neurological abnormalities rather than widespread purple lesions. Erythema Multiforme is characterized by target-like lesions and usually occurs as a reaction to infections or medications, not presenting with the deep purple hue typical of Kaposi Sarcoma. Pernicious Anemia can cause various oral manifestations but does not lead to the formation of purple lesions, as it is primarily linked to vitamin B12 deficiency and associated symptoms.

Understanding the specific features of these conditions aids in accurately identifying Kaposi Sarcoma based on the described clinical presentation of lesions.