Hello~You will need to see your GP if the drainage and yellow pus continues as this signifies an infection.
Rug burns are usually mild. However, if you have drainage and yellow puss that is the sign of an infection. You should have a healthcare provider look at it so they can prescribe an antibiotic. For home care you can wash the area with cold water and a gentle soap (Dove or Ivory). Gently pat dry and apply some gauze. You can apply a topical antibacterial ointment until you can get in to see a healthcare provider. Try to avoid clothing that is too tight and will irritate the area more. Good luck to you!