Skin Lesion Description
1. Flat Lesions
Macule
Flat, < 1cm.
(e.g., Freckle, Measles)
Patch
Flat, > 1cm.
(e.g., Vitiligo, Melasma)
2. Raised Solid Lesions
Papule
Raised, < 1cm.
(e.g., Acne, Wart)
Plaque
Raised, > 1cm (Plateau-like).
(e.g., Psoriasis)
Nodule
Raised, solid, deep component, > 1cm.
(e.g., Cyst, Lipoma)
3. Fluid-Filled Lesions
Vesicle
Clear fluid, < 1cm.
(e.g., Chickenpox, Herpes)
Bulla
Clear fluid, > 1cm.
(e.g., Bullous Pemphigoid)
Pustule
Contains pus (Yellow/White).
(e.g., Folliculitis, Acne)
4. Others
- Erosion: Loss of epidermis only (heals without scar).
- Ulcer: Loss of epidermis + dermis (heals with scar).
- Lichenification: Thickening of skin with exaggerated skin lines (due to scratching).
- Excoriation: Scratch marks.
- Crust: Dried serum, blood, or pus (scab).
- Scale: Flaking of the stratum corneum (e.g., Psoriasis, Tinea, Pityriasis versicolor).