Richard Reyes, the creator and longtime face of Pancho Claus, has been hospitalized as doctors investigate a mass or cyst in his brain.

In a post on Facebook, Reyes confirms he was told about the mass by a neurosurgeon and was told this is the reason why he keeps experiencing falls, weakness, and numbness on his left side.

Reyes says more tests will be done to determine the nature of the mass and whether or not it is cancerous or how it will be treated.