Final answer:
A vesicular rash in an immunocompromised person can be a sign of herpes zoster infection, commonly known as shingles.
Explanation:
Immunocompromised individuals, such as those with weakened immune systems due to conditions like HIV/AIDS, certain cancers, or undergoing immunosuppressive therapy, are at a higher risk of developing herpes zoster. Shingles is caused by the reactivation of the varicella-zoster virus, the same virus responsible for chickenpox.
This reactivation typically presents as a painful, blistering rash in a limited area of the body, following the path of a nerve and appearing as clusters of vesicles (fluid-filled blisters). In immunocompromised individuals, the condition can be more severe and widespread.