Hello there, My skin is bit oily and hard. Frequently blisters like things are appearing on my skin. They are little hard and little painful in the beginning. Later they are growing and a smoother area is forming on the top. When it breaks, I can see puss squeezing out for a while and it is also painful. Later they heal themselves and a dark spot os forming there. That dark spot is taking months to go away. Do you mind helping me understand why this is happening to me.