Shingles is a virus that is caused by the same virus that causes chickenpox, the varicella-zoster virus. Shingles are found in most people who had chickenpox because the varicella-zoster virus is dormant in the nerve tissue by your spinal cord and brain. The virus can become active again years after you suffered from chickenpox.
An ingrown hair can create a raised, red swelling that looks like a little lump. In some cases, the lump could have a discharge within it that becomes evident when ruptured. The area affected may have the following: