What is in the Differential Diagnosis for Brown and Grey Skin Conditions?
Discussion
This is the fourth in a short case series of differential diagnoses of colored skin conditions.
An introduction to dermatological terminologies and information about colors can be found here.
A differential diagnosis by distribution and common pattern can be found here.
For red, orange and yellow conditions, a review can be found here.
For green, blue and purple conditions, a review can be found here.
For black and white conditions, a review can be found here.
Note that any color can be a normal variant for an individual or is physiologic for a given state.
Acanthosis nigricans causes dark brown-black patches or streaks in skin creases especially on the neck, armpits and groin. It has a velvety elevated texture. It is caused by insulin resistance.
Learning Point
Brown is produced in several ways. Combinations of red, yellow and black, or orange and black are the usual ways.
The differential diagnosis for brown skin conditions includes:
Skin
Acanthosis nigricans
Addison disease
Cushing syndrome
Drug induced hyperpigmentation
Topical or systemic medications often with additional skin exposure
Incontinentia pigmenti
Neoplasms
Langerhans cell histiocytosis
Lymphoma
Melanoma
Pigmented purpuric dermatosis
Petechiae
Purpura
Telangiectasis
Post-inflammatory hyperpigmentation
Cosmetics
Inflammation
Sun
Trauma
Pregnancy
Melasma
Riehl melanosis
Seborrheic keratosis
Stasis dermatitis
Nails
Chemical-induced
Incontinentia pigmenti
Melanonychia
Trauma
Mucosa
I...
Source: PediatricEducation.org - Category: Pediatrics Authors: Pediatric Education Tags: Uncategorized Source Type: news
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