Light treatment

[D Foster]

I am surprised to hear that there is a "lifetime threshold" for light treatment as my doctor has always reassured me that there is no risk of skin cancer for light treatment.    

Having said that I was uvb for 7 years and the effect is wearing off, the P comes back very quickly the moment I reduce the dosage and also the burnt feeling on the skin is getting more unbearable for me.

I have read last week an article in the periodical of juni 2018, theme sunbathing, of the Psoriasis unity in the Netherlands. It is an interview with a leading dermatologist with expertise in skin cancer. She says: “you need vitamine D, but don’t go into the sun unprotected. Within 20 minutes you already can have skin burn. And a sunburnt skin enhances the risk on skincancer.”
The last paragraph tells about the addition of damage by sunburn. The sun (and also UVA and UVB) damages your cells. You have a repair mechanism, so the cells will be repaired. But when you keep on repeating and become a little older then this repair mechanism will start to falter. I could send you the article but it is in Dutch.  

I had UV for a long period of time and the dermatologist said I was reaching my maximum , it did work up to a point but when I came off it the P came back over a few months so bad I ended up in hospital which was probably a good thing as they found a problem with a lump on my back which they removed and I have not had any more trouble in that area again.
We are all different so you can't really compare one person to another only in a general way.