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Psoriasis Scalp Severity Index (PSSI)

Purpose: To evaluate a patient with scalp psoriasis using the Psoriasis Scalp Severity Index (PSSI).

Description

The Psoriasis Scalp Severity Index (PSSI) can be used to evaluate and monitor a patient with scalp psoriasis. It is a modification of the Psoriasis Activity and Severity Index (PASI) scoring system.


 

Parameters:

(1) type of change (erythema, induation, scaling)

(2) severity of psoriatic changes

(3) percent of scalp area involved by the change

Change in Psoriasis

Code

erythema

E

infiltration, induation

I

desquamation, scaling

D

 

 

Severity of Change

Points

absent

0

mild

1

moderate

2

moderate to severe

3

severe

4

 

 

Portion of Scalp Affected

Points

1 - 10%

1

10 – 29%

2

30 – 49%

3

50 – 69%

4

70 – 89%

5

90 - 100%

6

 

PSSI =

= ((points for percent of scalp area with erythema) * (points for erythema severity)) + ((points for percent of scalp area with induration) * (points for induration severity)) + ((points for percent of scalp area with scaling) * (points for scaling severity))

 

Interpretation:

• minimum score = 0

• maximum score = 72

• The higher the score the more severe the scalp psoriasis.

 


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Specialty

Objective

ICD-10