Carnation - Corn Caps Plasters (5). Carnation Footcare Corn Caps are a clinically proven, all-in-one method to remove painful corns. Soft felt ring relieves pressure over the corn with a measured dose of Salicylic Acid to remove the corn. One step application. Easy to apply. A combination of Salicylic Acid paste with a soft felt corn ring helps relieve pressure and pain whilst the corn is treated