Erythema nodosum (EN) is a non-specific nodular dermo-hypodermic rash characterized by the sudden occurrence of painful lumps located especially in the legs following a non-specific reaction to different internal and external antigens. Clinical and histological manifestations are stereotyped, regardless of the etiology. Erythema nodosum is most frequently associated with infections, particularly bacterial and less commonly viral, fungal, and parasitic. Other conditions can be discussed, including systemic diseases, malignant tumors, medicines, and vaccines. In almost half of cases, erythema nodosum is idiopathic if no cause is found. We report a case of erythema nodosum secondary to a Salmonella infection in a seven-year-old male. The peculiarity of our observation is the initial presentation of systemic signs that preceded the gastrointestinal symptoms.

A 35-year-old gentleman came to the ophthalmology outpatient department with complaints of bilateral ocular pain, redness and photophobia since three weeks with similar prior history. The patient was a diagnosed case of systemic sarcoidosis since two years with pulmonary, dermatological and neurological involvement for which he was already on treatment which included oral immunosuppressants, steroids, anticonvulsants and multivitamins. On examination, the best corrected visual acuity was 6/18 in the right eye and 6/12 in the left eye. On slit lamp and fundus examination, the patient showed signs of anterior and posterior uveitis in both eyes, the right eye more than the left eye. Treatment was initiated with topical corticosteroids and beta blockers and the patient improved following medical management.

Leprosy is a chronic infectious disease caused by the bacillus Mycobacterium leprae. The disease may evolve for inflammatory reactions, reversal reaction (RR) and erythema nodosum leprosum (ENL), the major cause of irreversible neuropathy in leprosy, which occur in 1 in 3 people with leprosy, even with effective treatment of M. leprae. Leprosy remains persistently endemic in our region where it predominantly affects lowest socioeconomic conditions people, as Toxoplasma gondii infection in the municipality studied. Previously, we have shown T. gondii coinfection as a risk marker for leprosy, mainly in its severe form. This present study assessed whether T. gondii infection is also a risk factor for leprosy reactions and the predictive value of immunoglobulin production prior to development of leprosy reactions. Patients with leprosy (n = 180), co-infected or not with T. gondii, had their serum investigated for levels of IgA, IgE, IgG1, IgG2, IgG3 and IgG4 anti-PGL-1 by ELISA prior to development of leprosy reactions. The serologic prevalence for T. gondii infection was 87.7% in leprosy reaction patients reaching 90.9% in those with ENL. The leprosy reaction risk increased in T. gondii seropositive individuals was two-fold ([OR] = 2.366; 95% confidence interval [CI 95%]: 1.024-5.469) higher than those seronegative, and considering the risk of ENL, this increase was even more evident (OR = 6.753; 95% CI: 1.050-72.85) in coinfected individuals. When evaluated the prediction of anti-PGL-1 immunoglobulin levels for development of leprosy reactions in patients coinfected or not with T. gondii, only the increase IgE levels were associated to occurrence of reactional episodes of leprosy, specifically ENL type, in patients coinfected with T. gondii, compared to those not coinfected or no reaction. Thus, the immunomodulation in co-parasitism T. gondii-M. leprae suggest increased levels of IgE as a biomarker for early detection of these acute inflammatory episodes and thereby help prevent permanent neuropathy and disability in leprosy patients.

UNASSIGNED: Tuberculides are characterised by delayed-type of immunologic reactions to Mycobacterium tuberculosis or its products in immuno-competent individuals. We herein describe clinico-epidemiological features and response to treatment in patients with tuberculides from a tertiary care centre from North India.
UNASSIGNED: This was a retrospective analysis of the clinical records of all the cutaneous tuberculosis (TB) patients (year 2000-2019) enrolled in the TB clinic. The patient records fulfilling the diagnostic criteria of tuberculides were considered for analysis.
UNASSIGNED: A total of 225 patients attended the tuberculosis clinic; out of this, 34 were diagnosed as tuberculides. Out of these 34 cases, 21 were identified as LS, 2 erythema induratum of Bazin, 1 papulonecrotic tuberculide, and 10 erythema nodosum. History of contact to open cases of TB was present in 15/34 (44.1%) patients. History of BCG vaccination was found in 15/34 (44.1%) patients. The focus of underlying TB could be identified in 20/34 (58.8%) patients. Skin biopsy was performed in all patients. In all patients, the diagnosis was confirmed by clinico-pathological correlation, positive TST, and the underlying focus of TB. All patients received 6 months regimen of anti-tubercular therapy with first-line drugs.
UNASSIGNED: In this study, we demonstrated various forms of tuberculides; lichen scrofulosorum was the most common form. We also included erythema nodosum cases also, which responded well to ATT. Observation from our study showed that tuberculides are important cutaneous markers for underlying tuberculosis infection, which helps in early detection of occult tuberculosis and timely management.

Sarcoidosis is an inflammatory and immune-mediated multisystemic disorder of unknown etiology, characterized by the presence of non-caseating granulomas, impacting various organs. This indolent condition manifests with numerous nonspecific symptoms and lacks a definitive diagnostic test, typically requiring histopathologic confirmation. However, a distinct and more readily diagnosable form of sarcoidosis does exist. The Löfgren syndrome (LöS) is characterized by the triad of erythema nodosum (EN), bilateral hilar lymphadenopathy, and symmetrical inflammatory arthralgias or arthritis. The simultaneous presence of these elements obviates the necessity for a biopsy. Predominantly affecting women in their second and third decades of life, this syndrome generally carries a favorable prognosis with spontaneous resolution or the requirement for a nonsteroidal anti-inflammatory drug (NSAID) alone. Despite its rarity, in particular cases, the treatment can be more challenging. This article presents a case study of LöS in a young woman, whose more aggressive disease course led to the need for steroidal therapy.

Erythema nodosum (EN) is the most common form of panniculitis and occurs in about one in 100,000 people. EN typically presents as an eruption of tender, erythematous nodules on the anterior aspect of the legs, although the face, trunk, and arms can also be involved. While the majority of cases are idiopathic, a subset of cases occurs in association with various triggers, including infections, medications, tumors, and autoimmune diseases. Rarely can EN develop in relation to pregnancy, which is thought to provide a physiologic background that favors its development. While pregnancy has been associated with EN in a minority of cases, currently, there is a limited amount of data suggesting that EN can develop in the late postpartum period. Herein, we present a case of a 20-year-old female with a six-week history of painful lesions on her lower extremities. A physical exam revealed multiple tender, erythematous nodules on the anterior aspect of the lower extremities, spanning from the knees to the toes. Laboratory workup showed no other identified triggers of EN in our patient besides pregnancy. Management of EN in our patient involved a low dose, six-day course of prednisone (initial dose of 15 mg/day) and ibuprofen for one week, leading to symptomatic improvement. Our case emphasizes the possibility of EN presenting in the late postpartum period. This case underscores the importance of considering EN in the differential diagnoses for women presenting with compatible lesions postpartum.

BACKGROUND: Coccidioidomycosis within endemic regions is often undiagnosed because appropriate testing is not performed. A dashboard was developed to provide information about the prevalence of coccidioidomycosis throughout the year.
METHODS: Banner Urgent Care Service has many clinics within Maricopa County, Arizona, a highly endemic region for coccidioidomycosis. All clinic visits and subset analyses for patients with International Classification of Diseases, Tenth Revision codes for pneumonia (J18.*) or erythema nodosum (L52) during 2018-2024 were included. Tabulated were daily frequencies of visits, pneumonia and erythema nodosum coding, coccidioidal testing, and test results. Banner Urgent Care Services\' counts of monthly coccidioidomycosis diagnoses were compared with those of confirmed coccidioidomycosis cases reported to Maricopa County Department of Public Health.
RESULTS: Monthly frequencies of urgent care coccidioidomycosis diagnoses strongly correlated with public health coccidioidomycosis case counts (r = 0.86). Testing frequency for coccidioidomycosis correlated with overall pneumonia frequency (r = 0.52). The proportion of pneumonia due to coccidioidomycosis varied between <5% and >45% within and between years. Coccidioidomycosis was a common cause of erythema nodosum (65%; 95% confidence interval, 45%-67%) and independent of pneumonia. Over half of Banner Urgent Care Services\' coccidioidomycosis diagnoses were coded for neither pneumonia nor erythema nodosum.
CONCLUSIONS: Data provided by the coccidioidomycosis dashboard can assist urgent care practitioners in knowing when coccidioidomycosis is prevalent in the community. Patients with exposure to endemic coccidioidomycosis who develop erythema nodosum or pneumonia should routinely be tested for coccidioidomycosis. Data from private health care organizations can augment surveillance of diseases important to public health.

UNASSIGNED: Patients with the multibacillary form of leprosy can develop reactional episodes of acute inflammation, known as erythema nodosum leprosum (ENL), which are characterized by the appearance of painful cutaneous nodules and systemic symptoms. Neutrophils have been recognized to play a role in the pathogenesis of ENL, and recent global transcriptomic analysis revealed neutrophil-related processes as a signature of ENL skin lesions.
UNASSIGNED: In this study, we expanded this analysis to the blood compartment, comparing whole blood transcriptomics of patients with non-reactional lepromatous leprosy at diagnosis (LL, n=7) and patients with ENL before administration of anti-reactional treatment (ENL, n=15). Furthermore, a follow-up study was performed with patients experiencing an ENL episode at the time of diagnosis and after 7 days of thalidomide treatment (THAL, n=10). Validation in an independent cohort (ENL=8; LL=7) was performed by RT-qPCR.
UNASSIGNED: An enrichment of neutrophil activation and degranulation-related genes was observed in the ENL group, with the gene for the neutrophil activation marker CD177 being the most enriched gene of ENL episode when compared to its expression in the LL group. A more pro-inflammatory transcriptome was also observed, with increased expression of genes related to innate immunity. Validation in an independent cohort indicated that S100A8 expression could discriminate ENL from LL. Supernatants of blood cells stimulated in vitro with Mycobacterium leprae sonicate showed higher levels of CD177 compared to the level of untreated cells, indicating that the leprosy bacillus can activate neutrophils expressing CD177. Of note, suggestive higher CD177 protein levels were found in the sera of patients with severe/moderate ENL episodes when compared with patients with mild episodes and LL patients, highlighting CD177 as a potential systemic marker of ENL severity that deserves future confirmation. Furthermore, a follow-up study was performed with patients at the time of ENL diagnosis and after 7 days of thalidomide treatment (THAL, n=10). Enrichment of neutrophil pathways was sustained in the transcriptomic profile of patients undergoing treatment; however, important immune targets that might be relevant to the effect of thalidomide at a systemic level, particularly NLRP6 and IL5RA, were revealed.
UNASSIGNED: In conclusion, our study reinforces the key role played by neutrophils in ENL pathogenesis and shed lights on potential diagnostic candidates and novel therapeutic targets that could benefit patients with leprosy.

Erythema nodosum (EN) is seen at any age with varying and often unidentified etiology. We studied the etiology and characteristics of EN in Northern Finland. Medical records of all patients with a diagnosis code for EN between 1996 and 2019 from Oulu University Hospital were retrieved and analyzed. There were in total 142 EN cases with a female predominance (n = 112, 72.9%). The mean age of the patients was 35.9 years. There were five cases diagnosed with EN in those younger than 2 years of age. Almost one third had EN nodules in multiple anatomical locations. In addition to skin findings, systemic symptoms were common (81.0%), and seen more often in men (p < 0.05). In children and adolescents, the most common etiological factors were gastroenteritis caused by \'Yersinia, Salmonella or Campylobacter\', followed by inflammatory bowel diseases and hormonal contraception. Bacterial infections were the most common etiological factor among adults. In 28.2% of the cases there was no identified causative factor. In this study, EN was seen surprisingly often in small children. Etiological factors varied markedly among different age groups and symptoms differed between the sexes in adults. These aspects should be taken into account when diagnosing EN patients.

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