PSORIASIS is a non infectious chronic inflammatory disease of the skin, characterized by well defined Erythematous plaques with silvery scales.
PSORIASIS may start at any age but is unusual before the age of 5 and the oldest recorded onset was in a patient aged 107.
FACTORS CAUSING FLARE UP OF PSORIASIS
TRAUMA: when the condition is erupting, lesions appear in area of skin damage such as scratches or Surgical wounds (KOBNER PHENOMENON)
INFECTIONS: beta haemolytic streptococcal throat infections often precede guttate psoriasis.
SUNLIGHT: rarely UVR may worsen psoriasis
DRUGS: Antimalarial, beta adrenoreceptors antagonists (BETA BLOCKERS) and lithium may worsen psoriasis.
EMOTIONS: Anxiety precipitates some exacerbation
TYPES OF PSORIASIS
STABLE PLAQUE PSORIASIS: Scalp (60%) patients with psoriasis, well demarcated easily palpable area, in palms it’s difficult to recognize as individual plaques may be poorly demarcated.
GUTTATE PSORIASIS: Mostly commonly seen in children’s and adolescents and may follow Streptococcal sore throat, lesions are droplet shaped, majority will develop plaque psoriasis later in life.
ERYTHRODERMIC PSORIASIS: Skin becomes universally red with hypo or hyperthermia.
PUSTULAR PSORIASIS: Generalized rare but very serious onset, sudden with large no of small Pustules erupting on red base, with swinging pyrexia coinciding with new pustules, primarily affects palms and soles.