My finger cracks.  They are rather painful.  Keeping hands dry helps.
Superglue can also help as can liquid bandage - all things I've learned
since.  I have also gotten these on canoe expeditions.
 Digitized from film.  Digitization information:
 
 Date: 2023:10:03 22:48:32
         File: wDenali_Tray_124.jpg 
Camera: PENTAX K-5 -- Lens: - at 100.0 mm -- Exposure: 1/5  f/8.0  ISO 160