Botryomycosis is a bacterial skin infection that typically presents with crusted, purulent large bumps.
[1] Sulphur granules generally discharge via sinuses, which heal leaving thin-skinned scars.
[1] There are only a handful of documented cases of botryomycosis in humans, and its pathogenesis is not completely understood.
However, it is usually described in individuals with impaired immunity, or with an underlying disease such as diabetes mellitus, cystic fibrosis or HIV infection.
[1] Risk factors include weak immune system, HIV, alcoholism, and Job syndrome.