Watnil Solution is a topical dermatological preparation containing Salicylic Acid (16.7%) and Lactic Acid (16.7%), formulated for the treatment of hyperkeratotic skin conditions such as psoriasis, eczema, calluses, corns, and warts. Salicylic Acid acts as a keratolytic agent, promoting the exfoliation of the stratum corneum by softening and loosening keratin, thereby facilitating the removal of scales and plaques. Lactic Acid, an alpha-hydroxy acid, complements this action by enhancing skin hydration and promoting gentle exfoliation, which aids in the restoration of normal skin texture and appearance. The combination of these acids provides a synergistic effect, improving the efficacy of treatment while minimizing irritation. Watnil Solution is typically applied once or twice daily to the affected areas, with careful avoidance of healthy surrounding skin to prevent undue irritation. It is contraindicated in patients with known hypersensitivity to salicylates or lactic acid, and caution is advised in those with extensive skin damage or open wounds. Adverse effects may include mild burning, stinging, or redness at the application site, which generally resolve with continued use. Patients are advised to follow the prescribed regimen and consult a healthcare professional if symptoms persist or worsen.