gram-negative toe web infection gram-negative toe web infection gram-negative toe web infection is a skin condition that often begins with dermatophytosis.: 272 gram-negative toe web infectionspecialtydermatology gram-negative toe web infection is a relatively common infection. it is commonly found on people who are engaged in athletic activities while wearing closed-toe or tight fitting shoes. it grows in a moist environment. gram-negative is mixed bacterial infection with the following organisms: moraxella alcaligenes acinetobacter pseudomonas proteus erwinia this mixing of infection and organisms may also cause a mild secondary infection of athlete's foot.