Lichenoid disorders

Author: Hon A/Prof Amanda Oakley, Dermatologist, Hamilton, New Zealand, 2011.

What are lichenoid disorders?

Lichen is found growing on trees and elsewhere in the garden or forest. It is a symbiotic fungus/alga characterised by flat topped organisms. Lichenoid skin disorders got their name from their appearance – also flat topped and often somewhat scaly. They are characterised by a particular type of inflammation found on histology.

Classification of lichenoid disorders

Lichenoid disorders include:

Lichen amyloidosis Lichen amyloidosis
Lichen myxoedematosus Scleromyxoedema
Lichenoid drug eruption Lichenoid drug eruption
Lichenoid keratosis Lichenoid keratosis
Lichen nitidus Lichen nitidus
Lichen planus Lichen planus
Lichen sclerosus Lichen Sclerosus
Lichen simplex Lichen simplex
Lichen spinulosus Lichen spinulosus
Lichen striatus Lichen striatus
Oral lichen planus Oral lichen planus
Pityriasis lichenoides Pityriasis lichenoides
Erosive lichen planus Erosive lichen planus
Lichen scrofulosorum  
Lichenoid amalgam reaction  
Oral lichenoid drug eruption