A cat has severe anal sac impaction and generalised ringworm.
Channel: Dr David Sing
Date: 2015-09-08

Sep 1, 2015. A bare patch, ringworm between the shoulders. A hairless patch below the tail. Anal sacs are swollen with thick black oil.  Anal sac impaction causes tail licking, chasing and hair loss. A very unusual case of anal sac oil coming out in long solid tubes when the sacs are expressed. 

Clipping bald is best as contaminated hairs of ringworm can be shaved off. Owner did not accept this advice.