<s>[INST] i have a lump in between my buttocks at the top iv had it for some time its red around the area and has maybe got slightly bigger over time, there is no drainage or anything from it though, not even much pain really just maybe slight discormfort, is this a pilonidial cyst ? [/INST] Hi, thanks for the query to Chat Doctor. Dear, I understood your health concerns. Based on the facts of your query, your red, sore lump seems to be an early stage indicated perifolliculitis of Hair follicle(Boil), or it could be Colonial Sinus, or it could be Sebaceous Cyst with mild re-infection. Treat-Rule out diabetes by Fasting/and Post-meal Blood Sugar studiesContact Surgeon and treat it with antibiotics / antipyretic/ and anti-inflammatory, with a long term followup. Surgical planned Excision of the Sebaceous Cyst or of the Chronic Boil or of the Colonial Sinus would be needed.US / CT study would fix the extent of the cause and its depth. Treatment could be planned according to the causes as suggested above. Hope this reply would help you to plan further treatment in your case. Good Day!! Chat Doctor. S. Genl-CVTS </s>