Is there a relationship between the onset of psoriasis and the onset of arthritis?
• Psoriasis precedes arthritis by an average of 8 to 10 years in ∼70% patients.
• Arthritis precedes psoriasis in ∼10% to 15% patients (particularly in childhood).
• Simultaneous onset of PsA and psoriasis occurs in ∼15% patients (this subgroup tends to flare skin and arthritis simultaneously during their disease course).
If psoriasis is not obvious what areas should be closely examined?
Always check the umbilicus, scalp, perineum, and behind ears.