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Skin
Primary Lesions
| Question | Answer |
|---|---|
| Macule | Flat lesions of less than 1cm. Different color from skin (brown, red, or white). Ex: freckles, flat moles, or rubella. |
| Patches | Macules are greater than 1cm. May have surface changes (scales or wrinkles). Ex: vitiligo or café au lait spots. |
| Papules | Small, firm, elevated lesions 1cm. Ex: warts or elevated moles. |
| Plaques | Elevated, plateau-like patches 1cm. Do not extend into lower skin layers. Ex: psoriasis or seborrheic keratosis. |
| Nodules | Elevated, marble-like lesions 1cm. wide and deep. Ex: lipomas. |
| Cysts | Nodules filled with liquid or semisolid material that can be expressed. Ex: sebaceous cyst. |
| Vesicles/Bullae | Blisters filled with clear fluid. Vesicles are 1cm. Ex: acute dermatitis. Bullae are 1cm. Ex: second-degree burns. |
| Pustules | Vesicles filled with cloudy or purulent fluid. Ex: acne and acute impetigo. |
| Wheals | Elevated, irregularly shaped areas of dermal edema. Ex: urticarial and insect bites. |
| Erosions | Wider than fissures involve only epidermis and may also have vesicles. Ex: Varicella or diaper rash. |