Case 164. 

Non-tuberculous mycobacterial infection of skin (43 y-o M)
　 　 　 　
　 Biopsy from a scaling skin nodule on the dorsum of the hand of a tropical fish seller 　
　 　 　 　

　

 　 A dark red-colored, irregularly elevated infiltrative lesion is seen on the dorsum of the hand (gross findings). This lesion has a nickname of swimming pool granuloma.