A married hindu female from a village presented with a hypopigmented lesion at the centre of forehead where she used to put bindi. Agent responsible for this lesion is:
**Core Concept**
The question is testing the student's knowledge of a condition known as leukoderma or vitiligo, which is characterized by the loss of skin pigment, resulting in hypopigmented lesions. This condition can be caused by various factors, including autoimmune, environmental, and traumatic causes.
**Why the Correct Answer is Right**
The condition described in the question is likely caused by a condition known as leukoderma or vitiligo, which can be triggered by the application of certain substances to the skin. The use of bindi, a cosmetic paste applied to the center of the forehead, may contain chemicals that can cause skin depigmentation. The correct answer is likely a substance that is commonly found in bindi preparations.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it is not a known cause of leukoderma or vitiligo.
**Option B:** This option is incorrect as it is not a known cause of leukoderma or vitiligo.
**Option D:** This option is incorrect as it is not a known cause of leukoderma or vitiligo.
**Clinical Pearl / High-Yield Fact**
It's essential to note that certain substances, such as kojic acid, hydroquinone, and mercury, can cause skin depigmentation and are commonly found in traditional Indian cosmetics like bindi. These substances can lead to leukoderma or vitiligo, especially if used excessively or for an extended period.
**Correct Answer: C. Kojic acid. Kojic acid is a known depigmenting agent found in some bindi preparations, which can cause leukoderma or vitiligo.**