It can be difficult for the doctor to diagnose psoriasis in the early stages, when
the disease may be limited to rough patches on the elbows. Certain symptoms, such
as a dandruff-like scalp condition or what looks like a fungal infection, may be
hard to recognize as psoriasis. Nail pits may be a sign of early psoriasis, but
they may also be a sign of other conditions.
Physical Examination: Psoriasis is typically diagnosed through physical examination
done by the doctor or health care practitioner.
The primary lesion of psoriasis is in the form of well – defined scaly papular patches
covered by silvery adherent scales. Scrapping the area with a glass slide leaves
a minute bleeding spot (Auspitz’s sign), which is diagnostic for psoriasis.
SCALE OF SEVERITY
The Psoriasis Area Severity Index (PASI) is the most widely used measurement tool
for psoriasis. PASI combines the assessment of the severity of the lesions and the
area affected into a single score in the range 0 (no disease) to 72 (maximal disease).
Psoriasis is usually graded as:
• Mild - affecting less than 3% of the body
• Moderate - affecting 3-10% of the body
• Severe - affecting more than 10% of the body
The degree of severity is generally based on the following factors:
• The proportion of body surface area affected
• Disease activity (degree of plaque redness, thickness and scaling)
• Response to previous therapies
• The impact of the disease on the person
Skin Biopsy: Can confirm the diagnosis of plaque psoriasis. However, it is
usually done to evaluate unusual cases of psoriasis or to rule out other conditions
when the diagnosis is not certain.
Blood Tests: Increased levels of antibodies to the streptolysin-O are present
in more than one half of patients of guttate psoriasis which indicates that the
patient had a streptococcal infection recently.
X-Ray of affected joints: The symptoms of psoriatic arthritis are similar
to other arthritic diseases such as rheumatoid arthritis, gout, etc. Radiological
examination helps to differentiate. However, most of the changes occur in the later
stages of the disease such as bony erosions occurring at the cartilaginous edge.
The differential diagnosis of psoriasis includes other scaling dermatoses. Such
dermatoses include the following:
• Seborrhoeic dermatitis that involves the scalp, nasolabial folds, and retroauricular
folds.
• Pityriasis rosea, which begins with a herald patch and is self-limited.
• Lichen simplex chronicus, which is caused by repeated rubbing or scratching.
• Parapsoriasis, which is characterized by atrophy, telangiectasia, and pigmentary
abnormalities.
• Pityriasis rubra pilaris, which is characterized by psoriasiform patches
that often begin in sun-exposed areas.
• Other conditions (e.g- discoid eczema or secondary syphilis) that can be differentiated
by clinical and pathological criteria.
MINIMISING FLARE-UPS
Tips that can help people living with psoriasis ease their discomfort and maximize
the effectiveness of treatment:
1. Diet: It is better to avoid animal and vegetable fat. Low sodium diet
is advised to avoid much exfoliation and itching.
2. Learn the triggers: Although it is not always possible to avoid every
trigger, knowing what triggers psoriasis can help a person make informed decisions.
3. Quit Smoking & Limit alcohol consumption: If one has psoriasis or a family
history of psoriasis, avoid them.
4. Reduce Stress: Joining a psoriasis support group, psychological counseling,
exercise and a number of relaxation techniques can effectively reduce stress.
5. Take good care of skin: Moisten the skin: Keep the skin moist so as to
prevent dryness and cracking. Using a non-mineral based aqueous cream will not suppress
the ailment & can offer great local relief.
Avoid scratching: The word “psoriasis” is derived from the Greek word “psora”
meaning itch. Scratching causes the skin to bleed and worsens psoriasis. It can
also puncture the skin, allowing bacteria to enter and cause an infection. So scratching
should be avoided.
Do not use irritating cosmetics or soaps.
6. Adjunct treatment: Occupational and Massage therapy involves physical
treatment of joints and muscles to reduce pain and improve function in case of Arthritis.