Site Name: Lichenoid dermatitis

The term Lichenoid dermatitis used histologically describes an infiltrate parallel to the dermo epidermal junction that is usually lymphocytic but can be plasma cells as in Zoon's balanitis or eosinophilic as in drug reactions.Changes such as basal layer degeneration,colloid bodies and melanin incontinence are also seen in conjunction.The commonest disorders associated with this feature are lichen planus,lichenoid keratoses and lupus erythematosus.

S-Squamous    Lichen planus,Pityriasis lichenoides,Lichen striatus

 

I-Infective     Zoon's balanitis,Syphilis,

 

G-Granulomatous

 

N-Neoplastic    Lichenoid keratosis, Reactions to epidermal neoplasms, Mycosis fungoides, Paraneoplastic pemphigus, Langerhans cell histiocytosis,Flegel's disease

 

D-Drugs     Lichenoid drug eruptions,

 

I-Immunological     Lichen sclerosus,Graft versus host disease,Lupus erythematosus, Paraneoplastic Pemphigus

 

P-Physical     Lichenoid pigmentary purpura,

 

M-Metabolic   

 

E-Endocrine  

 

N-Nutritional   

 

Others      Poikiloderma vasculare atrophicans

 

Adapted from Practical Dermatopathology by Ronald Rapini. Elsevier Mosby