Article
- Author:
- Richard P. Usatine, MD
Publish date: June 3, 2024
Though it is a benign finding in many individuals, especially those with darker skin tones, it is important to differentiate plantar hyperpigmentat...
Article
- Author:
- Richard P. Usatine, MD
Publish date: April 8, 2024
A brown, black, or gray pigmented linear band that spans the length of the nail plate due to excess melanin, longitudinal melanonychia may be attri...
Article
- Author:
- Richard P. Usatine, MD
Publish date: March 5, 2024
A patient presented with variable shades of brown covering more than 50% of the nail width. What's the condition and what are the key clinical feat...
Article
- Author:
- Richard P. Usatine, MD
Publish date: October 12, 2023
UV light illuminated the patient’s diagnosis.
Article
- Author:
- Richard P. Usatine, MD
Publish date: October 12, 2023
Allergic contact dermatitis (ACD) is an inflammatory condition of the skin caused by an immunologic response to 1 or more identifiable allergens.
Article
- Author:
- Richard P. Usatine, MD
Publish date: October 3, 2023
A Black woman with a rash on the neck that developed after new products were applied to th...
Article
- Author:
- Richard P. Usatine, MD
Publish date: August 7, 2023
An African woman presents with a growth on the lower lip decades after a large facial burn. What's the condition and what are the key clinical...
Article
- Author:
- Richard P. Usatine, MD
Publish date: July 25, 2023
Cutaneous squamous cell carcinoma (SCC) develops from a malignant tumor of the keratinocytes, eccrine glands, or pilosebaceous units that invades t...
Article
- Author:
- Richard P. Usatine, MD
Publish date: June 13, 2023
Forceful compression made a small papule grow into this 3.5 × 4.5–cm mass.
Article
- Author:
- Richard P. Usatine, MD
Publish date: June 12, 2023
Systemic lupus erythematosus (SLE) is a chronic autoimmune condition that affects the kidneys, lungs, brain, and heart, although it is not limited ...
Article
- Author:
- Richard P. Usatine, MD
Publish date: June 6, 2023
This Black woman has malar erythema and hyperpigmentation with sparing of the nasolabial folds. What's the condition and what are the key clinical ...
Article
- Author:
- Richard P. Usatine, MD
Publish date: April 10, 2023
Melasma (also known as chloasma) is a pigmentary disorder that causes chronic symmetric hyperpigmentation on the face. In patients with da...
Article
- Author:
- Richard P. Usatine, MD
Publish date: April 4, 2023
Hyperpigmentation on the cheeks, bridge of the nose, and upper lip in a Hispanic woman. What's the diagnosis?
Article
- Author:
- Richard P. Usatine, MD
Publish date: February 3, 2023
Vitiligo is a chronic autoimmune disorder characterized by areas of depigmented white patches on the skin due to the loss of melanocytes in the epi...
Article
- Author:
- Richard P. Usatine, MD
Publish date: January 27, 2023
The rapid growth of this lesion provided an important clue in the diagnosis.
