In simple words: Cutaneous mycobacterial infection is a skin disease caused by certain types of bacteria. It can cause skin sores, bumps, and swollen lymph nodes. It's diagnosed with tests like PCR and sometimes a biopsy.

Infection of the skin and underlying tissues caused by mycobacteria other than Mycobacterium leprae and Mycobacterium tuberculosis complex. This includes infections due to Mycobacterium ulcerans (Buruli ulcer) and Mycobacterium marinum.

Example 1: A patient presents with a painless nodule on their arm after swimming in a saltwater aquarium. The nodule is diagnosed as a Mycobacterium marinum infection., A patient who recently traveled to West Africa develops a large, painless ulcer on their leg. It is confirmed to be a Buruli ulcer caused by Mycobacterium ulcerans., A child presents with multiple skin lesions and swollen lymph nodes. After ruling out other causes, tests confirm a cutaneous mycobacterial infection.

Clinical findings, laboratory tests (e.g., PCR), imaging studies (if bone involvement is suspected), and biopsy results.