Dr. N K Mandora

Psoriasis, pityriasis rosea, erythroderma or exfoliative dermatitis, lichen planus and other lichenoid eruptions.
 It is common, chronic non infectious skin disease characterized by well - defined slightly raised, dry erythematous macules with silvery scales typical extensor distbution.
Etiology:- 
The exact etiology is unknown. A genetic predisposition is evidenced by a positive family history in 25% patients association of hla b8 a 17.

• Biochemcial.
•  Many immunological abnoormalities have been found but their role is uncertain.
•  The increased epidermal cell proliferation of psoriasis is related to increased replication metabolism of dermal fibroblasts.

Pathology:- 

•  Parakeratosis.
•  Elongation of rete pegs.
•  Micro abscess of'munro.
•  Dilated and tortuous capillary in upper dermis.
•  Edema round cell infilteration in the papillae upper dermis.

 Investigations:-

•  History is typical.
•  Biopsy is rarely required.
•  Diagnosis
•  Atopic dermatitis.
•  Impetigo.
•  Reiter's syndrome.
• 
  Symptoms and signs

Next homeopathicy treatment symptoms/sig base medicines apply.