If the blockage occurs under the skin, it creates a white bump known as a " whitehead" , and if the blockage is above the skin and black discoloration occurs, it's known as a " blackhead" .

如果在皮肤下形成堵塞，那就会产生一种叫“白头粉刺”的白色痘痘，如果皮肤表层形成堵塞，黑色粉刺就会出现，也叫“黑头”。