onycholysis drug-induced or light-induced: known porphyrias cutanea tarda. onycholysis without any trauma (no subungual bleeding detectable) with known high light sensitivity. onycholysis in this case is to be considered as a summation effect.
Tinea unguium; distal subungual type of onychomycosis; starting from the hyponychium there is a striated yellow discoloration of the nail matrix; the matrix is crumbly destroyed.
Psoriasis of the nails. single (only on the thumb), complete, crumbly onychodystrophy (psoriatic crumb nail). massive swelling and redness of the whole thumb, infestation of the joints in the ray (so-called sausage fingers).
Pachyonychia congenita: congenital nail dystrophy affecting all fingernails and toenails with palmareratoses; claw-shaped, thickened fingernails and toenails.
Psoriasis of the nails. lifting of the integrity of the nail plate, instead crumbly nail material. thickening of the nail plate in places as well as splintering in the distal area.
Pachyonychia congenita: congenital nail dystrophy affecting all finger and toe nails with palmoplantar keratoses: shown here are claw-shaped, thickened and bent toenails.
Onychodystrophia psoriatica. moderate onychodystrophy of the index finger nail of a 30-year-old man. the nail matrix is distally crumbly and chipped off. isolated splinter hemorrhages are visible. almost centrally a small yellowish oil stain shimmers through. hyperkeratotic nail fold.
Onycholysis, drug-induced or light-induced. Incident light microscopy: Yellowish-brownish discoloration of the right big toe nail after tetracycline therapy and sunbathing in a 54-year-old man. The nail matrix appears partially disintegrated in a cloggy manner. Clinical signs: Detachment of almost all fingernails as well as yellow-brownish discoloration and subtle lifting of the nail bed.
Onycholysis drug-induced or light-induced: Oyncholysis marked by arrow. Known Porphyrias cutanea tarda. Onycholysis without any trauma occurred (no subungual bleeding at the proximal onycholysis margin detectable).
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