Cutaneous granular bacteriosis, a rarely diagnosed infection of the head and the neck.

A young man presented with a large multilobulated and mutilating tumour of the scalp, which had been relapsing for years. Histological examination of a biopsy from the lesion revealed chronic inflammation with granulation tissue and presence of granules with eosinophilic periphery, which was positive for Gram, Grocott and periodic-acid-Schiff stains. A large excision was performed. Cultures grew Staphylococcus aureus. The patient was treated with penicillin G, but 4 weeks after the start of treatment, new small nodules appeared over the same area. All these new nodules disappeared within 2 weeks the addition of clindamycin and cotrimoxazole. This triple antibiotic treatment was carried on for 18 months, and the patient remained disease-free after a follow-up of 4 years. Although the lesions were clinically and histologically suggestive of actinomycosis, culture revealed that they were caused by a completely different organism. We suggest grouping such lesions under a single term "granular bacteriosis" and combining surgery with broad-spectrum antibiotics covering Actinomyces species and botryomycosis-causing organisms (mainly Staphylococcus).