I've never had psoriasis, but 2 years ago I had Guttate psorriasis athe age of 34yrs. It lasted for 3-4 months, it was terribly itchy and I scratched until it bled. It went away, but left terrible skin deep dark marks. I've tried almost every topical cream and oil available, but I still have the marks. What can i do to remove these marks?

Summarized question: What can i do to remove the Guttate psorriasis marks?