Another form of an under boob rash could be heat rash, also known as miliaria. Heat rash under the breasts is caused by abnormal sweat gland function

Rash Under Breast (Interigo): Causes, Treatment, and More

Is It a Stress Rash or Something Else?

Rash Under Breast (Interigo): Causes, Treatment, and More

Heat Rash or Prickly Heat (Miliaria Rubra) Condition, Treatments and Pictures for Children - Skinsight

Clinical methods & therapeutics

Miliaria - Wikipedia

Another form of an under boob rash could be heat rash, also known as miliaria. Heat rash under the breasts is caused by abnormal sweat gland function

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A Case Of Complicated Miliaria Rubra (Heat Rash)

Miliaria - wikidoc