Interstitial granulomatous dermatitis with arthritis (IGDA) is a rare disease that was first described by Ackerman1 in 1993. Fewer than 70 cases have been reported in the literature,2 and specific therapies are not available. We report here a case of severe recalcitrant IGDA that was successfully treated with ustekinumab.
Correspondence: Dr Leloup, Department of Dermatology, 1 Place Alexis Ricordeau, Nantes University Hospital, 44000 Nantes, France (firstname.lastname@example.org).
Conflict of Interest Disclosures: None reported.
Additional Contributions: We are indebted to E. Cassagnau, MD, pathologist at Nantes University Hospital, France.
Figure 3. Complete skin remission after 6 months of ustekinumab treatment.
Figure 2. Dermal infiltrate of histiocytes around foci of collagen degeneration.
Figure 1. Disseminated violaceous plaques and papules on the thighs (A) and back (B).
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