Nail Deformities and Dystrophies By Chris G Adigun, MD, Dermatology & Laser Center of Chapel Hill Reviewed / Revised Dec 2021 | Modified Sep 2022 View Patient Education Topic Resources Darier Disease (Nails) Koilonychia Yellow Nail Syndrome Terry Nails Beau Lines Due to Chemotherapy Beau Lines Nail Psoriasis With Pitting... Nail Bed Psoriasis With Onycholys... Nail Psoriasis With Thickening... Lichen Planus of the Nail Pterygium of the Nail Nail Discoloration Due to... Mees Lines (Leukonychia Striata) Green-Nail Syndrome Median Nail Dystrophy Melanonychia Striata Acral-Lentiginous Melanoma... Onycholysis Pincer Nails Trachyonychia Myxoid Cyst Pyogenic Granuloma (Nail) Deformities are often considered together with dystrophies, but the two are slightly different; deformities are generally considered to be gross changes in nail shape, whereas dystrophies are changes in nail texture or composition (eg, onychomycosis).