Gram-negative folliculitis. Follow-up observations in 20 patients.

Gram-negative folliculitis cleared with antibiotics effective against lactose fermenting-gram-negative rods and Proteus organisms in 19 of 20 patients with acne vulgaris. The systemic antibiotic therapy was discontinued after varying periods and the infection remained clear without further treatment for four to 48 months. Nasal cultures were negative for gram-negative organisms on follow-up repeated culture in 12 patients free of infection.