Skin

• lichen striatus
  17 June 2004

  Images
  Lichen striatus (lichenoid inflammation and perieccrine inflammation ) https://twitter.com/faisalmohammedi/status/834896649977802754 https://twitter.com/GBRainwater/status/854350881856344067
  Synopsis
  lichenoid inflammation
  peri-eccrine inflammation / peri-eccrine lymphocytic infiltrate
  DIFFERENTIAL:
  linear lichen planus
  lichen niditus
  inflammatory linear verrucous epidermal (...)

• cutaneous mastocytosis
  17 June 2004

  cutaneous mastocytoma

• transient acantholytic dermatosis
  16 June 2004

  Grover disease (GD), benign papular acantholytic dermatosis, transient acantholytic dermatosis, persistent acantholytic dermatosis WKP
  Definition: Grover’s disease (GD) is a polymorphic, pruritic, papulovesicular dermatosis characterized histologically by acantholysis with or without dyskeratosis.
  Once confirmed, most cases of Grover’s disease last six to twelve months, which is why it was originally called "transient". Unfortunately it may last much longer. Nevertheless, it is not to (...)

• lichen planus
  16 June 2004

  WKP
  Definition: Lichen planus is a papulosquamous disease. In its classical presentation, it is characterized by pruritic violaceous papules most commonly on the extremities of middle-aged adults. It may or may not be accompanied by oral and genital mucous membrane involvement. Its course is generally self-limited for a period of several months to years, but it may last indefinitely.
  There are many clinical variants described, ranging from lichenoid drug eruptions to association with (...)

• sebaceous hamartoma
  16 June 2004

  nevus sebaceous of Jadassohn
  Digital case
  JRC:10863 : nevus sebaceous of Jadassohn.
  Images
  Naevus sebaceous https://twitter.com/KUSAURAP/status/739449241853005824 https://twitter.com/AnnieMorrisonMD/status/733020032783933442
  Scalp lesion. BCC and syringocystadenoma papilliferum arising from nevus sebaceous. https://twitter.com/A_Elshaikh/status/877680662551171073
  DIFFERENTIAL
  sebaceous hyperplasia senile sebaceous hyperplasia
  sebaceous adenoma
  epidermal nevus
  wart (...)

• sebaceous adenoma
  16 June 2004

  Differential diagnosis
  sebaceous hamartoma (sebaceous nevus of Jadassohn)
  sebaceous hyperplasia
  sebaceoma
  sebaceous carcinoma
  Predisposition
  Muit-Torre syndrome (MSI disease)
  See also
  sebaceous tumors

• relapsing polychondritis
  16 June 2004

  CLINICAL: painful erythema and edema involving both ears and nose, eventually leading to flabby ears and saddle nose
  HISTOPATHOLOGY: mixed inflammatory infiltrate (lymphocytes, plasma cells, and neutrophils) involving the deep dermis and cartilage. Cartilage cell vacuolisation and pyknosis leading to total destruction and replacement by fibrous tissue
  DIFFERENTIAL: chondrodermatitis nodularis chronica (...)

• chondrodermatitis nodularis helicis
  16 June 2004

  chondrodermatitis nodularis chronica helicis
  Images
  Chondrodermatitis nodularis helicis https://twitter.com/maxkong2011/status/753078285731524609
  Differential diagnosis
  actinic keratosis
  relapsing polychondritis
  cutaneous ulcer

• Spitz nevus
  16 June 2004

  Spindle and epithelioid cell nevus, spitz tumor, spitz’s nevus, spindle cell nevus, juvenile melanoma, benign juvenile melanoma, epitheliod junctional nevus; Spitz tumor WKP PO
  Definition: Spitz nevus is usually a pink papule on the extremities or face of young patients. It has little pigmentation, spindle and epithelioid cells, is usually compound, and may have eosinophilic globules known as Kamino bodies.
  Images
  Spitz nevus: Melanocytes with ample cytoplasm. Note the collagenous (...)

• granuloma annulare
  15 June 2004

  Annular granuloma PO
  Definition: Granuloma annulare (GA) is a benign inflammatory, self-limiting granulomatous dermatoses that is seen in both adults and children . Females are more commonly affected than males. The lesions may involve skin and/or subcutaneous tissue. The etiology of GA is unknown.
  Granuloma annulare is a dermatosis, usually self-limited, of unknown etiology and characterized by necrobiotic (collagenolytic) dermal papules that often assume an annular configuration. (...)

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