The modified target nail psoriasis severity index has been proposed for target nail assessment which would give a degree of gradation for each parameter of 0 to 3 (0 = none, 1 = mild, 2 = moderate, and 3 = severe) in each quadrant.The topical therapies include topical and intralesional corticosteroids , topical vitamin D3 analogues (calcipotriol) , topical tacrolimus and tazarotene[8]. The efficacy of these topical therapies in nail disease is limited mainly by the impenetrability or low penetrability of the nail and nail matrix. In patients with nail psoriasis that is resistant to topical therapies, conventional systemic therapies (e.g., phototherapy, retinoids, cyclosporine, methotrexate) have been shown to be partially effective. More recently, biological therapies (e.g., infliximab, adalimumab, alefacept, etanercept) have proven efficacy in psoriasis and psoriatic arthritis, and some are effective in treating nail disease in patients with psoriasis .