Causes of localized hypopigmented macule or patch are all except
**Localized Hypopigmented Macules**
**Core Concept**
Localized hypopigmented macules or patches are skin lesions characterized by a loss of pigment in a specific area, which can be caused by various factors including inflammatory, infectious, and neoplastic processes.
**Why the Correct Answer is Right**
The correct causes of localized hypopigmented macules or patches include **vitiligo**, **pityriasis alba**, **lichen sclerosus**, and **dermatophyte infections**. Vitiligo is an autoimmune disease that leads to the destruction of melanocytes, resulting in white patches on the skin. Pityriasis alba is a common condition in children characterized by hypopigmented patches on the face, often associated with eczema. Lichen sclerosus is a chronic inflammatory skin condition that can cause hypopigmentation in affected areas. Dermatophyte infections, such as ringworm, can also lead to localized hypopigmentation due to the destruction of skin cells and melanocytes.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect as **tinea versicolor** is actually a cause of hypopigmentation, not hyperpigmentation. It's a superficial fungal infection that causes discoloration of the skin.
* **Option B:** This option is incorrect as **lichen planus** is a mucocutaneous disease that can cause oral and genital lesions, but it's not typically associated with localized hypopigmentation.
* **Option C:** This option is incorrect as **erythema multiforme** is a skin condition characterized by target-shaped lesions, but it's not typically associated with localized hypopigmentation.
* **Option D:** This option is incorrect as **dermatomyositis** is an inflammatory disease that affects the muscles and skin, but it's not typically associated with localized hypopigmentation.
**Clinical Pearl / High-Yield Fact**
When evaluating localized hypopigmented macules or patches, it's essential to consider the patient's age, medical history, and the distribution of the lesions to arrive at an accurate diagnosis.
**Correct Answer:** A.