Definition

Noun: A skin condition characterized by the appearance of dark, thickened, velvety patches of skin, typically in body folds and creases. This dermatological finding is often associated with insulin resistance and can be a marker for underlying medical conditions, ranging from benign endocrine disorders to more serious malignancies.

Usage

This term is used exclusively as a medical noun to name a specific dermatological sign. It is primarily employed in clinical, diagnostic, and academic contexts by healthcare professionals.

Examples

• The patient's acanthosis nigricans was noted during the physical exam, prompting screening for type 2 diabetes.
• Acanthosis nigricans is frequently found in the axillae and on the back of the neck.
• The sudden onset of severe acanthosis nigricans can sometimes be a paraneoplastic syndrome associated with internal cancer.

Advanced Usage

• As a clinical indicator: The presence of acanthosis nigricans is often a visible clue for physicians to investigate potential insulin resistance, polycystic ovary syndrome (PCOS), or, in rare cases, an underlying adenocarcinoma.
• Descriptive terminology: In medical literature, it is often described by its location (e.g., "axillary acanthosis nigricans") or potential cause (e.g., "malignancy-associated acanthosis nigricans").

Variants and Related Words

• Acanthosis (noun): The medical term for abnormal thickening of the stratum spinosum layer of the skin. Acanthosis nigricans is a specific type of acanthosis.
• AN (abbreviation): A common clinical abbreviation for acanthosis nigricans.

Synonyms

• Keratosis nigricans: An older, less frequently used synonym.

Notes on Different Meanings

This term has a single, specific meaning in medical terminology. It does not have general or figurative uses outside of clinical practice.

Noun

1. a skin disease characterized by dark wartlike patches in the body folds; can be benign or malignant