Erythema nodosum after golimumab treatment in ankylosing spondylitis patients: a case report and literature review

INTRODUCTION: Erythema nodosum (EN) is a self-limited septal panniculitis that presents with fever, arthralgia, and arthritis. Tumor necrosis factor alpha (TNF-α) inhibitor such as golimumab has been found to treat EN in inflammatory bowel diseases (IBD). We herein report the paradoxical occurrence of EN following golimumab for ankylosing spondylitis. CASE PRESENTATION: A 34-year-old female presented in June 2022 with a complaint of ‘sores’ on her feet that intermittently presented for approximately 5 months but that had worsened dramatically in the last 24 h. The patient had an 8-year history of ankylosing spondylitis for 7 years. Subcutaneous golimumab was administered every 4 weeks as she had not responded to other treatments. Twenty-four hours after the fifth subcutaneous injection, painful, erythematous nodules appeared, histologically compatible with EN. Despite this side effect, we continue therapy due to the good response and efficacy. DISCUSSION: Skin reactions were associated with the treatment with golimumab, including warm tender skin around the injection site, eruptions, itchiness, and sometimes a full-body rash. Golimumab was successfully used in treating EN in Crohn’s disease. Because our patient continued on golimumab, the temporal association of EN flares with therapeutic injection and the lack of any etiology support a direct causal relationship between EN and golimumab treatment. CONCLUSION: TNF-α inhibitors are useful in treating Crohn’s disease patients with EN, although it may present as an adverse effect of this treatment. Further work is needed.