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Primary Lesions
When lesion develops on previously unaltered skin
| Word | Definition | Examples |
|---|---|---|
| Macule | Solely a color change, flat and circumscribed of less than 1 cm | freckles, flat nevi, hypopigmentation, scarlet fever |
| Patch | Macules that are larger than 1 cm | monogolian spot, vitiligo, measles rash |
| Papule | Something you can feel less than 1 cm diameter, due to superficial thickening in epidermis | elevated nevus (mole), lichen planus , wart (verruca) |
| Plaque | Papules coalesce to form surface elevation wider than 1 cm. | psoriasis, lichen planus |
| Nodule | Solid, elevated, hard or soft , larger than 1 cm. May extend deeper into dermis than papule | Xanthoma, fibroma, intradermal nevi. |
| Tumor | Larger than a few centimeters in diameter, firm or soft, deeper into dermis; may be benign or malignant. | Lipoma, Hemangioma |
| Wheal | Superficial, raised, transient, and erythmatous; slightly irregular shape due to edema | Mosquito bite, allergic reaction, dermographism |
| Urticaria (Hives) | Wheals coalece to form extensive reaction, intensely pruritic | (blank) |
| Cyst | Encapsulated fluid-filled cavity in dermis or subcutaneous layer, tensely elevating skin | Sebaceous cyst, wen |
| Vesicles | Elevated cavity containing free fluid, up to 1 cm. Clear serum flows if wall is ruptured | herpes simplez, early varicella (chickenpox), Shingles |
| Bulla | Larger than 1 cm diameter, Unilocular, Superficial in epidermis, it is thin walled and ruptures easily | friction blister, pemphigus, burns |
| Pustule | Turbid fluid (pus) in the cavity. Cirrcumscribed and elevated | Impetigo, acne |