I had this black spot on my legs from last two years. I met doctor ( Dermatologist) and he said it is seborrheic Keratosis. He applied liquid nitrogen once, after some time some part of it has fallen down about 80 % but not completely. I am attaching photo for your reference. 1 pic is prior to liquid Nitrogen given and in the 2 nd pic current position. My question is whether it is seborrheic keratosis and why it is growing back again on the same spot. Whether any thing serious?. Any further test needs to be done ? Pls help and guide .