<prompt> If you are a doctor, please answer the medical questions based on the patients description.I have large painful lump on lower right buttocks. It appeared a few days ago Sore to sit on and touch Does not move when touch. I also have a lump under my left armpit approx. 3 inches below it .This one moves has grown over last few weeks, Is not very sore. Also weight loss unintentional Fatigue.Thank You YYYYYY  <response>: Hello rearward welcome to Chat Doctor.come have evaluated your query in details . Buttock lump indicates acute infective lesion, needs immediate evaluation with your consultant surgeon. Armpit lump likely to be lymph node, will be ad Chat Doctor. At present can have relief with tab. Ibuprofen400 mg and ice application. Wishing you fine recovery. Feel free to ask any further queries. Regards . 