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Psoriatic nails are characterized by a translucent discolouration in the nail bed that resembles a drop of oil beneath the nail plate. [2] Early signs that may accompany the "oil drop" include thickening of the lateral edges of the nail bed with or without resultant flattening or concavity of the nail; separation of the nail from the underlying nail bed, often in thin streaks from the tip-edge ...
Nail pitting often accompanies distal interphalangeal joint involvement and may be essential in differentiating psoriatic arthritis from other diseases. [6] Psoriasis can also cause damage to the nails, such as pitting or separation from the nail bed, [ 5 ] onycholysis , hyperkeratosis under the nails, and horizontal ridging.
Pitting of the nails is associated with psoriasis. Beau's lines are horizontal ridges in the nail. Habit-tic deformity is a condition similar to Beau's Lines caused by long-term skin picking.
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Parakeratosis pustulosa is most commonly seen in children as an eczematoid eruption near the free margin of the nail that extends to the dorsal nail fold. Under the free margin of the nail, hyperkeratosis causes the nail plate to pull up and results in a deformity that resembles a gaping toecap separated from the sole at the seam. Pitting and ...
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Psoriatic erythroderma can be congenital or secondary to an environmental trigger. [12] [13] [14] Environmental triggers that have been documented include sunburn, skin trauma, psychological stress, systemic illness, alcoholism, drug exposure, chemical exposure (e.g., topical tar, computed tomography contrast material), and the sudden cessation of medication.
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