vảy da
Definition
Noun:
- Skin scale: A small, thin, plate-like piece of dead skin that naturally detaches from the epidermis, often associated with dry skin conditions or certain dermatological diseases.
- Dandruff: When referring to the scalp, "vảy da" commonly means dandruff—white or greyish flakes of dead skin cells that shed from the scalp.
Noun (medical/biological context):
- Squama (plural: squamae): The technical term for a scale or scaly layer of skin, used in medical and zoological descriptions.
Usage Examples
- Noun:
- Da đầu anh ấy có nhiều vảy da. (His scalp has a lot of dandruff.)
- Bệnh vẩy nến làm xuất hiện những mảng vảy da bạc trắng. (Psoriasis causes patches of silvery-white skin scales to appear.)
- Con rắn lột xác để loại bỏ lớp vảy da cũ. (The snake sheds its skin to remove the old layer of scales.)
Advanced Usage
- In dermatology, "vảy da" is a symptom, not a diagnosis. It is observed in conditions like eczema, seborrheic dermatitis, and ichthyosis.
- The spelling "vẩy da" (with a hook on the vowel) is also commonly used and considered a variant.
Variants and Related Words
- Vảy (n): A general term for a scale (on fish, reptiles, or skin).
- Vảy nến (n): Psoriasis scale; the specific thick, silvery scale characteristic of psoriasis.
- Tróc vảy da (v): To desquamate; to peel or shed skin scales.
Synonyms
- Flake: A small, thin piece of skin, especially one that has peeled off.
- Scale: A more general term for a small, hard plate forming part of an animal's skin or a skin condition.
- Dandruff: Specifically for scales of dead skin on the scalp.
Related Terms and Notes
- Desquamation (n): The medical term for the process of shedding or peeling off in scales.
- "Vảy da" is often confused with "vảy" alone, which can mean fish scales or reptile scales. The context usually clarifies the meaning.