Characteristic lesion of scabies is –
**Core Concept**
Scabies is a skin infestation caused by the mite Sarcoptes scabiei, leading to intense itching and a characteristic skin lesion. The mite burrows into the upper layer of the skin, causing inflammation and a range of symptoms.
**Why the Correct Answer is Right**
The characteristic lesion of scabies is the burrow, which is a small, wavy, or thread-like track on the skin where the mite has burrowed. This lesion is typically found in areas where the skin is thin, such as the fingers, wrists, and genital area. The burrow is usually accompanied by intense itching and a small, raised, or flat papule.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the papule is not a characteristic lesion of scabies, although it may be a feature of the skin reaction to the mite. The papule is a general term for a small, raised area of skin, which can be caused by many different conditions.
**Option B:** This option is incorrect because the vesicle is not typically associated with scabies. While vesicles may occur in some cases of scabies, they are not a characteristic feature of the disease.
**Option C:** This option is incorrect because the nodule is not a characteristic lesion of scabies. Nodules may occur in some cases of scabies, but they are not a specific or diagnostic feature of the disease.
**Clinical Pearl / High-Yield Fact**
To diagnose scabies, look for the characteristic burrow in areas where the skin is thin, such as the fingers, wrists, and genital area. The burrow is usually accompanied by intense itching and a small, raised, or flat papule.
**Correct Answer: C. Nodule**