I've recently been diagnosed with a malignant melanoma, just waiting for a date to have a wider area removed to check its clear of cancerous cells. I had an appointment to give blood so phoned to say I couldn't make it and asked how soon I could donate again. They said if you've ever had a melanoma you can never donate again.
It surprised me a bit, I thought once you'd been treated for cancer and then been signed off (after the requisite amount of years) you had the same risk of having cancer as anyone else.
Does anyone know why they don't let you donate ever again?