Hi, Thanks for writing to us. She might be having a variant of cutaneous tuberculosis known as scrofuloderma. Scrofuloderma is direct skin involvement from underlying lymph node . The area of enlarged lymph node becomes blue then finally ruptures to form a sinus that may heal with scarring. I would advise that you get the area examined by a dermatologist for further management. Teeatment is combination of antitubercular drug ony for six months. Rifampicin alone would not be helpful. Hope thst answers your query. Take care