In 90% of cases of AIDS-associated Kaposi's sarcoma (KS), the lesion is observed in the oral cavity. Oral KS usually reveals distinct clinical features characterized by a brown-bluish or otherwise pigmented appearance. The histological features are identical to classical KS. The occurrence of a non-pigmented oral KS in 2 male homosexual patients has prompted the present case reports. Clinicians should be aware that not all cases of AIDS-associated oral KS appear as brown or purplish tumors but may present without any discoloration.