Abstract: To report a case of actinomycetic mycetoma caused by Nocardia ninae.A 37-year-old female was admitted for erythema,papulopustule,nodus,sinuses and keloidal scars in the upper thoracic wall for up to 20 years.The first lesion appeared in the middle of right clavicle,and spreaded graduately to the upper thoracic wall and lower neck,with adventitious mild pain.Erythema,papulopustules,nodus,sinuses and keloidal scars were found in the thoracic wall and neck.Sulphur grains were determined by biopsy.Staphylococcus epidermidis and Nocardia sp.,with 98.1% simlarity to Nocardia ninae OFN 02.72T was identified by sequence analysis.The final diagnosis was actinomycetic mycetoma cauesed by Nocardia ninae.

Key words: mycetoma, Nocardia species, actinomycete