Interstitial granulomatous dermatitis with arthritis (IGDA) or Ackerman dermatitis syndrome is a skin condition that most commonly presents with symmetrical round-to-oval red or violet plaques on the flanks, armpits, inner thighs, and lower abdomen.
[1] Interstitial granulomatous dermatitis with arthritis commonly presents with symmetrical round-to-oval red or violet plaques on the flanks, armpits, inner thighs, and lower abdomen.
The symmetrical nature of the joint involvement is evident, frequently affecting the fingers, elbows, wrists, and shoulders.
[3][4][5] Autoantibodies, elevated erythrocyte sedimentation rate (ESR), and rheumatoid factor positivity are among the abnormal serologic findings reported in the majority of IGDA patients.
[6] This entity has a unique histopathology that is characterized by a diffuse, dense inflammatory infiltrate that is primarily made up of histiocytes within the reticular dermis.