What are the differential diagnosis for longitudinal melanochyia?
A: Melanotic macula of the nail unit
B: Nail matrix nevus
D: Subungual Hematoma
E: Subungual Melanoma
What are the ABCDEF for subungual malenoma?
A: peak incidence?
B: breadth greater than?
A: Age: Peak incidence: 5th to 7th decade of life,
African-American > Native American > Asian
B: Brown-Black band with breadth greater than 3mm
C: Change in nail band morpology despite tx
D: Digit involved Thumb> Hallux>index finger > multiple digits dominant hand
E: Extension of the the brown-black pigment of the nail bed, nail matrix and/or nail plate onto the adjacant cuticle or proximal and lateral nail folds
F: Family or personal history
What are some local and regional causes of melanonychia?
1. Trauma (acute or chronic): Multiple bands
2. Poor fitting shoes
3. Radiation therapy
4. Ultraviolet light
What are some of the systemic causes of melannychia?
1. Addison Disease
2. Cushing Syndrome
4. Acquired immunodificiency syndrome
5. Malnutrition/ Vitamin B deficincy