Hoping someone can help me identify a medication

[Ddubya]

When I was 15 I had my first significant psoriasis outbreak. I was away from home for the summer so I went to a doctor I'd not seen before. He prescribed some sort of cream for me. It didn't come in a tube but in a 4oz white container with a screw on/off lid. It was was the consistency of hand lotion, quite runny, and was a whitish colour with a greenish/yellowish tint. I was instructed to apply it twice a day and it worked amazingly well and years went by before I had another outbreak. I have no idea what it was. it was so long ago that I have no way of finding the doctor (long retired) and asking him. I've tried many things since and nothing has been as effective as this medication was. I suspect it was not a steroid as the use instructions had none of the usual warnings that come with the corticosteroids medications, but I could be wrong.

If this description rings a bell with any of you please let me know what you think it might have been.

Thanks

duaneaise@gmail.com