Hi Shweta, Welcome to HCM. Thanks for writing in. Certain types of infection are not responsive to usual antibiotics. A higher antibiotic course for longer duration can cure the condition. A proper examination and blood work up would be needed to establish diagnosis. A pus culture and sensitivity would be needed to decide antibiotic usage. Consult a qualified dermatologist for proper diagnosis and treatment. Hope this helps. Wishing you good health. Regards. DrSudarshan MD Dermatology.