The best replacement for pus is mucus.

The best alternatives to pus are rated as following:
★★★★★  mucus
★★★★  puss
★★★★  exudate
★★★  lymph
★★★  tonsil stones
★★  serous fluid
★★  lymph fluid
★★  new skin
★  drainage
★  scab
★  colostrum
★  pus
★  phlegm
★  yellow pus
  white pus
  slough
  purulent

Your alternative for pus is not listed? Suggest!
Speaking about pus, one probably shouldn't forget about black spot.

Other search terms related to pus and their ratings are:
★★★★★ black spot
★★★★ ingrown hair
★★★ ingrown toenail
★★ infection
★★ mastitis
★★ cellulitis
★ hemorrhoids
★ lip piercing
★ stitches
★ tonsils
gout
strep
gingivitis
sore throat
You have in mind a companion for pus and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of pus in all years. Click on graph for more.
pus
mucus
puss