Comby's sign

Com·by's sign

(kŏm-bēz′, kôN-)
n.
An early indication of measles in which thin whitish patches appear on the gums and buccal mucous membrane.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.