<s>[INST] I have a lump on my tailbone just above my bum crack that is causing me pain and discomfort. I have an existing lump slightly further down that swells up. It then pops and bloody puss comes out. I am wondering if I can put a pin in it to relieve the pain and keep it clean? [/INST] Hi, your description suggests that you have a Colonial sinus which is also probably infected. You must be having the swelling for some time now. It must be hurting even when you put water on it. I suggest you get examined by a Surgeon. For the infection you will require a course of antibiotics. Once the infection subsides you should keep the area clean and after a few weeks of no infection you should get it removed by a Surgeon. Operation will cure you of the problem. It is a small operation, and you need not worry.  Take care and do let me know if you need any more advice. You can leave a Specialist query for the same. Chat Doctor.  </s>