Jadassohn Nevus

Jadassohn Nevus


Jadassohn Nevus is a rare type of birthmark. It is mostly present on the scalp by birth. It may also found on the face, neck or forehead. The ailment consists of overgrown upper layers of the skin, sebaceous glands, hair follicles and connective tissue. It may classify as a benign tumor of the hair follicle. In children, it presents as a solitary, smooth hairless patch,  which oval in shape.In adults, it mostly appearing bumpy, warty or scaly.


The real causes of it are following:

  • Defect in ectoderm
  • Mosaic genetic abnormality
  • Abnormality of PTCH gene
  • Developmental delay
  • Epileptic seizures
  • Hemiparesis


The main signs and symptoms are following:

  • A hairless lesion
  • Immature hair follicles
  • Immature sebaceous glands
  • Slightly raised yellow to light-brown plaques
  • Smooth velvety surface
  • Thickened nodular area
  • Lesions
Emma Sage Asked on September 2, 2016 in Disease.
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