Have you noticed a hardening or thickening of your skin underfoot? Wondering what it is? While typically there is little need to be alarmed, calluses should be kept in check to prevent health issues from developing. Calluses may be unsightly or even annoying, but that doesn’t mean they’re always bad for your health since they offer protection. There are, however, instances when calluses can have serious health consequences. If someone suffers from diabetes for example, calluses can prevent them from feeling pain and can, thus, lead to health issues.