Linear lesions

Linear lesions are also quite strikingly obvious. Consider plant contact dermatitis, herpes zoster, lichen striatus and ILVEN or inflammatory linear verrucous epidermal nevus! Some conditions form linear configurations after an injury or scratch. This is known as the Koebner reaction or phenomenon and is seen most often in psoriasis. Mosaicism of the skin can also give linear forms of innumerable skin disorders eg linear porokeratoses.

Linear lesions on the trunk include those on the chest,back and abdomen.

The commonest linear lesions on these areas would be epidermal nevi particularly ILVEN and also lichen striatus.Inflammatory linear with blisters would suggest herpes zoster, followed by a plant contact dermatitis or a phytophotodermatitis from a photosensitising sap or juice eg limes.A tender thrombosed vein on the chest wall is known as Mondor's disease.

SIGN DIP MEN Overview of Linear lesions

S-Squamous Lichen striatus,ILVEN(inflammatory linear verrucous epidermal nevus),Psoriasis,Lichen simplex,,Lichen planus,Darier’s disease,Lichen nitidus,

I-Infective Herpes zoster,Cutaneous larva migrans,Warts including molluscum

G-Granulomatous

N-Neoplastic Porokeratoses,Sebaceous nevus,Epidermal nevi,Linear benign tumours Syringomas,Trichoepitheliomas,and Eccrine spiradenomas,Linear porokeratoses,,Leiomyomas,Segmental neurofibromatosis,Linear Basal cell nevus syndrome

D-Drugs

I-Immunological Vitiligo,Linear Morphea,Graft versus host disease,

P-Physical Scratching,Dermatographism,Plant contact dermatitis,Pigmented purpuric dermatosis,Mondor’s disease,Linear fibromatosis,Linear common diseases because of the Koebner effect

M-Metabolic Papular mucinosis

E-Endocrine Pregnancy pigmentary lines

N-Nutritional

Others- Linear lesions following Blaschko’s lines, Linear disease variants due to Mosaicism, Incontinentia pigmenti, Hypomelanosis of Ito, Goltz syndrome, Conradi syndrome,