Answer to Medical Challenge
The answer to the image from yesterday and another image above is
Psoriasis is a common condition and affects the skin with patches of raised red patches with silvery scales. In the United States, about 7 million people have psoriasis. As you can see, it can also affect the fingernails and toenails. In people with skin psoriasis, 10-55% have psoriatic nail disease and 10-20% also have psoriatic arthritis. Of people with psoriatric arthritis, 50-85% have affected nails.