I wouldn't know exactly. I was working huge hours under tons of stress while trying not to totally give up hopes for a social life. Rather than spending hours I didn't have outside getting a tan, I found that I could go to a tanning salon once a week during lunch break and achieve the same cosmetic effect.
My skin is fair and I had a number of blistering burns as a child and teenager.
With few exceptions, excessive sun exposure is pretty much what causes melanoma.
As I look back on my case, I suspect an association between my prior sun blisters, use of the tanning beds and extreme stress I was under.
My diagnosis was metastatic malignant melanoma. Nobody thought I would live but 20 years later, I'm still kicking.
WOW. Glad to see you still around. Best Wishes.