Almost all cases are unilateral (affecting one side only). Shingles under the breast is not uncommon. In fact, the thoracic dermatome, comprised of 12 vertebrae (T1-T12), is the most common site ...

When this virus becomes active later in life, it causes shingles. Symptoms include: The rash is most common in the thoracic dermatomes. If it’s in one or two neighboring dermatomes, it’s ...