No ,this small abscess can’t move to thigh , and MRI shows no inflammation/abscess in Ischiorectal fossa ,check for redness /swelling etc there may be other swelling like boil etc in thigh . for fistula , you can take antibiotics course after consulting your doctor or me .Usually fistula does not heal and need treatment ,.upload previous MRI
Next Steps
No it usually does not spread to Thigh ,take antibiotics course
Health Tips
Check for redness ,swelling in thigh junction if it’s there and You are running fever then consult your doctor .