Chicken pox is a viral disease caused by varicella zoster virus. Once the infection is over, small number of viral particles stay dormitory in the body. They might multiply once again when the immune system weakens. Then they would cause Herpes zoster, commonly known as shingles. Herpes zoster is characterized with rash similar to the one in chicken pox. However, it usually affects the skin from only one dermatom. Severe pain is usually present, too and might be preceding the rash. Some nonspecific symptoms like fever and headache might be present in the beginning of the illness, which might result in misdiagnose.
Since you do not report the characteristic distribution of the rash in only one dermatom nor the severe pain, something else might be causing the bumps on face, back, legs and buttocks. You might want to visit dermatologist to check for the bumps. If herpes zoster is suspected, laboratory tests to confirm it might be needed.
The treatment would depend on the definitive diagnose.
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