These two sites are awful. They literally only display links that they get paid for. And they don't even do a good job with it. In some cases the affiliate links are a worse offer than others publicly available.
Shingles, a viral infection of the nerve roots caused by the chickenpox virus, can sometimes lead to a painful complication called post-herpetic neuralgia. Sometimes, a physical stress like cold or sunburn can bring on an attack. Even clothing touching the skin or a cool breeze can cause excruciating pain.
Shingles is caused by the Varicella Zoster virus, the same virus that causes chickenpox. Only someone who has had chickenpox, or rarely, has gotten chickenpox vaccine, can get shingles. The virus stays in your body, and can cause shingles many years later. You can't catch shingles from another person with shingles.