Psoriasis Under The Toenails: [Nail Pits, Causes & Best Treatment] Psoriasis Under Toenails can result in #1)severe thickening, #2)discoloration and #3)pitting of the toenails. Learn how to make your toenails better! Look: Psoriatic toenails with pitting can be improved with a few simple treatment changes. We are foot doctors & we see this problem get … Read more