<s>[INST] Dear doctor, my mom recently found a hard lump under her butt cheek, one month ago was a bean size, right now its like a thumb size, when you press it, its a bit painful, I am worried, what can it be? will it be something serious?? and which kind of doctor she should visit? thank you very much [/INST] Hi, Good Morning-from INDIA. I am Chat Doctor. N.here to take of your health query from Chat Doctor virtual Clinic. Thanks for your Health-query to Chat Doctor Clinic.-I studied your query in-depth and I understood your concerns.-My opinion-Its an infection of the hair follicle of the butt cheek, caused in the bruised, frictioned butt tissue there.-It is painful on pressure due to the cellulitis spread around the hair follicle.-It's not much serious as it could be treated and would go away in 2-3 days time after treatment with your family doctor.-Advise-Right doctor to consult is -Surgeon- who would treat after clinical examination accordingly-a-tb-NSAIDs-To reduce the cellulitis and pain associated with it.b-Antibiotics-according to the severity or mildness of the infection in the boil. So don't worry -this boil or/ infected hair follicle will recover soon.-Still if it worries you, Consult your family doctor or Surgeon which would re-assure you. Hope this would help you recover fast out of the butt cheek Lump anxiety. Wellcome to Chat Doctor again for better Health and Living. </s>