Smallpox and chickenpox are both diseases that present with vesicles and cause skin damage. However, chickenpox rashes tend to appear in clusters on the face, abdomen, and back, with some spreading to the arms, while smallpox lesions primarily concentrate on the hands and feet.

Shingles (Herpes Zoster occurs in individuals with a history of chickenpox. After recovering from chickenpox, the virus remains dormant in nerve tissues near the spinal cord and brain, waiting for the immune system to weaken before reactivating as shingles.