I recently used RetinA as it was recommended to me by a Dermatologist to help prevent the development of future sebaceous hyperplasia. I used the product exactly 6 times and it helped to exfoliate the skin on my nose. In doing so, it made a ton of spider veins on my nose bright red and so much more visible. It didn't cause the spider veins, but made the existing ones readily apparent.
Beware and don't use RetinA if you are prone to spider veins! I am using Differin gel now and it is much better. Now I have to get laser treatment for the veins and even then, will probably have to get treatments every 6 months to a year for the rest of my life to help keep the veins under control. I am in my early 30's.