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![Dark Brown Hyperkeratotic Nodule on the Back](https://cdn-uat.mdedge.com/files/s3fs-public/styles/max_width_small/public/images/article_teasers/ct1070040016_e_300x300.png)
Dark Brown Hyperkeratotic Nodule on the Back
- Author:
- Amanda Kraus, MS
- Ashley Elsensohn, MD, MPH
- Nil Celebi Cherukuri, MD, PhD
- William Tyler, MD
A 71-year-old woman presented with a persistent asymptomatic lesion on the right upper back that had recently increased in size and changed in...