Hi there. I hear you & understand your anxiety. I take it either the treating dermatologist did not fully explain the procedure & its outcome or you did not follow it completely before undergoing the cryotherapy. The swelling & pain is common post-cryotherapy & the lesion should peel off or it may require a second sitting after a week or two. However, pus is not a usual occurrence & suggests a secondary infection. Are you a diabetic by any chance or do you have a lowered immunity on any account? Please take an appropriate antibiotic & all will be well. No need to panic. Get back to the doctor who treated you as it will require a prescription. For these very same complications, I am not a big fan of cryotherapy & much prefer the tangible removal of the lesion either by lasers or simple Electrosurgery that produces immediate results. If in Bangalore region, please drop in to see me for a free consult at Vikram Hospital or Sita Bhateja Hospital depending on which area you reside. Good Luck & Godspeed. Dr Praveen Rodrigues MD