Final answer:
M. marinarum causes skin lesions, swelling, tenderness, and pain, and in those with compromised immune systems, it may lead to joint pain, muscle aches, and systemic illness.
Step-by-step explanation:
Mycobacterium marinum (M. marinarum) is a type of bacteria that can cause infection in humans. Infection usually occurs after exposure to contaminated water, especially in aquariums or fish handling. The main symptoms of M. marinarum infection are skin lesions that may progress to deeper structures if not treated promptly.
These lesions typically develop two to three weeks after exposure and appear as reddish or tan bumps on the skin, which may turn into ulcers. Infected individuals may also experience swelling, tenderness, and pain in the affected area. In some cases, especially in individuals with compromised immune systems, the infection can spread and cause more serious symptoms such as joint pain, muscle aches, and systemic illness.