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A serum IgG4 concentration greater than 1.35 g L SP -1 sp is suggestive of IgG4-RD.[3] Histological features of IgG4-RD include a dense lymphoplasmacytic infiltrate, storiform fibrosis and obliterative phlebitis. A 55-year-old woman presented with a 7-month history of an erythematous plaque affecting the right preauricular skin and ipsilateral swelling of the ear. The diagnosis of IgG4-RD relies on a combination of clinical, histopathological, radiographical and serological features.[3] Common laboratory abnormalities include elevated serum IgG4, serum IgE and eosinophilia.[5] The degree of serum IgG4 elevation correlates with the number of organs involved; however, a significant minority of patients will have a normal serum IgG4. [Extracted from the article]

We describe a case of follicular mucinosis presenting with patchy alopecia affecting the eyebrows. White gelatinous material, with an appearance consistent with mucin, was also visible along the hair shafts of the eyebrow lesions (Fig. On dermoscopy, white gelatinous material (presumed to be mucin) was visible along the hair shafts of the eyebrow lesions. [Extracted from the article]