<s>[INST] we found a boil on our 7 year olds left butt cheek friday. It was swollen, red, warm, and tender to the touch. Today tuesday we found a lump or mass in her left inguinal region. It is tender to the touch as well. We want to know if these two are related. Thanks [/INST] Dear parent, the boil is due to staph aureus infection. The swelling, redness and tenderness are signs of pus accumulation. This needs an antibiotic ointment application 3 times daily. If the boils is large it may need surgical Chat Doctor.  The lump in the groin is a lymph node reaction in response to the boil. Yes they are related. The lymph node reaction usually requires no treatment and resolves in its own when the boil is treated. If it is painful the may use an analgesic such as acetaminophen or ibuprofen syrup 3 times daily </s>