The rash that accompanies the shingles infection changes in appearance throughout the course of the infection, and may present a variety of different physical characteristics depending on the severity of the infection, according to ConsultantLive. The rash can range from a reddening of the skin to fluid-filled pustules.
Shingles is caused by the same virus that causes chicken pox, reports WebMD. After having chicken pox, the virus remains inactive in the roots of nerves. If the virus becomes active, a rash appears along the course of the nerve, and shingles rashes appear in bands along the body. The active virus is most likely to produce an outbreak in people whose immune systems are weakened by age, stress or disease.