Background: Pyoderma vegetans (PV) is a rare neutrophilic dermatosis of unknown etiology. Currently, there are no treatment guidelines for PV. Systemic steroids are often used as first-line therapy, but recurrence upon discontinuation or tapering is common.Materials and methods: We tested the efficacy of doxycycline at a dose of 200 mg/d to treat resistant PV.Results: After 4 weeks of treatment we noticed a significant improvement in the clinical appearance of PV.Conclusions: Our case demonstrates the potential utility of doxycycline as a systemic steroid-sparing agent in the treatment of PV.

Dogs often carry methicillin-resistant Staphylococci asymptomatically. These bacteria are frequently linked to conditions such as canine pyoderma and otitis. Close interaction between dogs and humans can facilitate the exchange of resistant strains, particularly Methicillin-resistant Staphylococcus pseudintermedius (MRSP). This represents a public health issue, since these strains, in addition to occasionally causing infections in humans, can also serve as a source of resistance and virulence genes for strains of greater importance in human medicine, such as Staphylococcus aureus. Furthermore, MRSP strains are often multidrug resistant, which ends up compromising the treatment of infections. This study aimed to assess the potential transmission of Staphylococcus pseudintermedius among dogs and their owners. We examined a total of one hundred canine samples collected from cases of pyoderma and otitis to detect the presence of staphylococci. Simultaneously, we conducted evaluations on all dog owners. Staphylococci strains were identified using MALDI-TOF MS and PCR targeting the nuc gene. Methicillin resistance screening was also performed by detecting the mecA gene using PCR. Among the sampled dogs, 64 carried S. pseudintermedius. Nine were identified as MRSP. In six instances, dogs and their owners exhibited S. pseudintermedius. These samples underwent genome sequencing and were screened for antimicrobial resistance genes, SCCmec typing, MLST characterization, and Single Nucleotide Polymorphisms (SNP) analyses. The results of the phylogenetic analysis revealed that in three cases, dogs and owners had closely related isolates, suggesting interspecies transmission. Two of these cases involved MRSP and one MSSP. Moreover, in the two MRSP cases, the same SCCmec type (type V) was detected. Additionally, the sequence type was consistent across all three cases involving dogs and owners (MSSP ST2277, MRSP ST2282, and ST2286). These findings strongly indicate a transmission event. Since Staphylococcus pseudintermedius is primarily isolated from canine samples, it is plausible that dogs may have acted as a potential source. In the remaining three cases, despite identifying the same species in both samples, they had notable phylogenetic differences.

Pyoderma gangrenosum (PG) is a rare neutrophilic dermatosis of unclear etiology that exhibits pathergy and can develop post-operatively in surgical incisions. To the best of our knowledge, this is the first case report of PG developing after a gunshot wound (GSW) injury or in a contaminated surgical wound. We further propose umbilical sparing as a key clinical finding differentiating the diagnosis of PG from more common infectious etiologies.

Blastomycosis-like pyoderma (BLP) is an uncommon tissue response possibly to bacterial infection that presents as vegetative skin lesions usually in immunocompromised patients. Staphylococcus aureus is the most frequent pathogen implicated in BLP. Here, we report the case of a 32-year-old man who had ulcerative vegetating lesions on extremities for 3 months over preexisting recalcitrant tinea lesions. The patient was hypertensive with a history of chronic graft rejection after renal transplantation 8 months earlier and was on long-term immunosuppressants. Investigations revealed anemia, mild hyperglycemia, and elevated serum creatinine. Histopathology showed suppurative and fibrosing perifolliculitis with moderate pseudocarcinomatous hyperplasia and the culture of biopsy specimen demonstrated growth of Escherichia coli and Citrobacter koseri. The diagnosis of BLP overlying dermatophytoses was made. The skin lesions improved completely with parenteral antibiotics. Local immune dysregulation by dermatophytoses along with iatrogenic immunosuppression may have favored this rare pyoderma.

The aetiology of dermatitis in dogs is often complex, and primary or secondary bacterial infections are common. In this report we describe a case where Listeria monocytogenes was proposed to be the bacteriological cause of a pyoderma in a 4-year-old Giant Schnauzer. The infection manifested as a cutaneous listeriosis with multiple pustulae on the dog\'s back. The dog was treated with clindamycin and recovered within 1 week. The source of infection was suggested to be a carcass or the faeces of a wild animal, or a decomposed placenta from an infected animal.

BACKGROUND: Pyoderma gangrenosum (PG) is a rare non-infectious inflammatory disease of unknown etiology that affects the skin and mucous membranes. The occurrence of pyoderma gangrenosum after a reduction mammoplasty is a very rare complication, which at first glance may seem like an infectious complication; in reality, however, it is an inflammatory disease.
METHODS: This case report describes a rare postoperative complication - pyoderma gangrenosum and its appropriate treatment in our patient who underwent reduction mammoplasty.
CONCLUSIONS: Early detection of this complication is essential for the patients recovery because the primary surgical treatment can lead to worsening of the condition and is therefore contraindicated in such a case. Pyoderma gangrenosum must be treated conservatively with corticosteroids.

Pyodermatitis-pyostomatitis vegetans (PD-PSV) is rarely reported in the pediatric population. Here, we provide a review of pediatric PD-PSV in the literature and report a case of widespread PD-PSV in a 15-year-old male without a previous history of inflammatory bowel disease or gastrointestinal symptoms. Clinical, histological, and immunopathological workup established PD-PSV and revealed subclinical Crohn\'s disease. Treatment with infliximab was effective in inducing rapid resolution of the lesions.

BACKGROUND: Pyoderma gangrenosum (PG) is a rare neutrophilic dermatosis characterized by painful and ulcerating lesions on the skin. It rarely involves the face and is often difficult to diagnose. There are few cases reported in the literature of PG involving the face.
OBJECTIVE: To share our experience with 5 patients in whom the final diagnosis was PG involving the face, and to review the literature.
METHODS: We report a series of 5 patients with a final diagnosis of PG involving the face and reviewed relevant literature. We searched through PubMed andEMBASE using keywords such as \"face\" and \"pyoderma gangrenosum,\" \"blastomycosis-like pyoderma gangrenosum, vegetative pyoderma gangrenosum and granulomatous pyoderma gangrenosum.\"
RESULTS: We report 5 patients (4 females) with pyoderma gangrenosum involving the face. All 5 had a final diagnosis of superficial granulomatous PG. All cases presented with nonhealing facial ulcer most commonly on cheeks and a common histopathology of mixed inflammatory infiltrates, multinucleated giant cells, and plasma cells with some granulomatous inflammation.
CONCLUSIONS: PG can involve the face, and all 5 of our patients had the superficial granulomatous as the most common form.

Scleredema is a connective tissue disorder that presents as diffuse induration of skin, most often involving the upper body. Scleredema can be associated with prior infection, monoclonal gammopathy, and diabetes mellitus. Pyoderma gangrenosum is a neutrophilic dermatosis that presents as an ulcer with violaceous borders. Pyoderma gangrenosum can be idiopathic or associated with various conditions. A 66-year-old man with a 20-year history of scleredema diabeticorum presented with idiopathic pyoderma gangrenosum in the affected area of scleredema on his neck. His pyoderma gangrenosum resolved after treatment with topical and intralesional corticosteroids. Diseases associated with scleredema, pyoderma gangrenosum or both are reviewed.

Superficial granulomatous pyoderma (SGP) is a rare pyoderma gangrenosum (PG) variant that differs from classic PG in that the ulcers tend to be more superficial, lack a rapidly advancing border, and are not typically associated with an underlying systemic disease. The ulcers are most commonly painless and located on the trunk, with a clean granulating base. They generally do not show undermining but may have a vegetative border. Lesions usually respond well to either topical or intralesional corticosteroids with complete healing. The classic histopathologic finding is a \"three-layer granuloma\" in the superficial dermis consisting of central neutrophilic inflammation and necrosis, a surrounding layer of histiocytes and multinucleated giant cells, and an outer most layer of plasma cells and eosinophils. Herein, we present a unique case of SGP with sporotrichoid-like distribution on the lower extremity.