Many reasons: Not sure if you are a man or a woman, but a man can have folliculitis on the chest hair, both can have acne there too, and many other reasons can cause raised red bumps. Best is to see your doctor to examine the rash and give you a proper diagnosis.
Answered 10/4/2016
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A doctor has provided 1 answer
3 doctors weighed in across 2 answers
A doctor has provided 1 answer
A doctor has provided 1 answer
2 doctors weighed in across 2 answers
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