| Term |
Definition |
| Arthritis‐psoriatica |
Inflammation of 1 or more joints (oligo‐ or poly‐arthritis) closely associated with skin psoriasis, nail changes, or both |
| Carry‐over effect |
The treatment effect will be affected, depending upon the order in which they were received. Carry‐over treatment effect across periods |
| Distal portion of the nail matrix |
The closest part of the nail matrix (ground substance of the nail) to the body |
| Erythematous |
Flushing of the skin due to dilatation of the blood capillaries |
| Exocytosis |
The appearance of migrating inflammatory cells in the epidermis |
| Koebner phenomenon |
Lesions appearing on lines of trauma or other triggers |
| Lunula |
Nail moon |
| Nail dystrophy |
Destruction of the nail plate |
| Onicolisi/Onycholysis |
Separation or loosening of part or all of a nail from its bed |
| Onicoressi |
Fragile nails with thin longitudinal tracks |
| Onycholysis |
Separation or loosening of part or all of a nail from its bed |
| Onychomadesis |
Loosening of the nail from the nail bed |
| Onychorrhexis |
Longitudinal grooves that can split to the nail bed |
| Parakeratotic foci |
Parts of the horny layer of the upper skin in which cells still contain nuclei |
| Parakeratosis pustulosa, acropustulosis keratotica, acrodermatitis continua of Hallopeau |
Other nail diseases partly resembling nail psoriasis |
| Paronychia |
An inflamed swelling of the nail fold |
| Psoriasis |
A chronic inflammatory skin disease characterised by thickened patches, inflamed, red skin covered with thick, silvery scales |
| Salmon patches |
A dyschromia/discolouration of the nails resembling an oil patch |
| Subungal hyperkeratosis or subungual keratosis |
Thickening of the outer horny layer of the skin underneath the nail |
