Rosai-Dorfman disease (RDD), otherwise known as sinus histiocytosis with massive lymphadenopathy, is a rare disease. Cutaneous RDD (CRDD) is an extremely rare form of RDD, which is limited to the skin. The present study examined a case of purely CRDD in a 25-year-old female patient who presented with a two-month history of red plaques on her face. In addition, a review of the literature was conducted, where the etiology, pathology, clinical characteristics and treatment of the disease were discussed. From a dermatological perspective, the current study aimed to emphasize the histological features and clinical morphology of cutaneous RDD. Clinicians should have sufficient knowledge to be able to recognize and manage this rare condition. The present study found that the presence of reddish-yellow nodules on the face without any particular sensitivity may be useful in the diagnosis of CRDD. Treatment with topical steroids was found to be beneficial in alleviating CRDD.
Studies were conducted to investigate the effects of hydrous Fe‐ and Al‐oxides in relation to pH upon SO4 retention by Soils. “Less SO4‐retentive” soils exhibited SO4 adsorption of the Latosols or Ando soils after coating with the hydrous oxides. The pH‐dependent SO4 retention was much more marked after the coatings were applied. Retentive soils are made much less retentive by treatments for the removal of the hydrous oxides while the less retentive soils show appreciable SO4 adsorption when the hydrous oxides are added. In the acid range, the amount of SO4 adsorption is essentially proportional to the amounts of hydrous Fe‐ or Al‐oxides present. Aluminum‐oxides are more effective in retaining SO4 than Fe‐oxides when both are present as coatings on soil particles. The Fe system exhibited increasing adsorption with increased acidity whereas the Al system showed a maximum at pH 4.0. Subsequent decreases of SO4 adsorption by Al‐coated soils at lower pH values were shown to be associated with dissolution of the hydrous Al oxide phase.
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