Not able to pull back foreskin if erect.

Hi, If erect i am not able to pull back foreskin, If i do forcefully, its so painful. 1 yr back, i cant pull back in flaccid state also.. and there was some discoloration in foreskin. I visited an urologist, he examined and mentioned nothing serious and recommended to clean the glan regularly. I did so and i was able to pull back the skin easily in flaccid state.. but still little discoloration there and not able to pull back when its erect. Can you please suggest if there is any cream i can try to cure the discoloration/swelling completely.. On googling some post suggest to try topical steroid cream. Please suggest if i can try any such Cream. PS: I don't have/never had any redness or itchiness except the slight discoloration. Thanks