Doctors in Canada described the cases of two women in their 40s with a rare immune system disorder called idiopathic multicentric Castleman disease (iMCD). Both women also had xanthelasma, which are yellowish patches of cholesterol that can appear on the eyelids. Their blood tests showed no typical high cholesterol levels that usually cause these patches.
The women were treated with a medication called siltuximab, which is approved for their type of Castleman disease. Their main disease symptoms, like anemia and inflammation, showed a partial improvement with this treatment. However, the xanthelasma on their eyelids did not get better or go away.
The doctors also looked at past medical reports and found three other cases where patients with a different form of Castleman disease had similar skin growths that did disappear after surgery. This suggests there might be a link between the immune problems in Castleman disease and the development of these skin patches, but it is far from proven.
It is crucial to remember this is just a detailed story about two patients. Their experience cannot tell us what will happen for other people. More research involving many more patients is needed to understand if there is a real connection between these two conditions and why the treatment helped the disease but not the skin issue.