Classical `Rain drop’ lesions seen in –
**Core Concept**
Classical "rain drop" lesions are a characteristic histopathological feature observed in a specific dermatological condition. These lesions are typically round, discrete, and have a well-defined border, resembling raindrops. The appearance of these lesions is due to the accumulation of a specific type of inflammatory cell within the skin.
**Why the Correct Answer is Right**
The correct answer is associated with the deposition of immune complexes in the dermal papillae, leading to the formation of these characteristic lesions. This condition is characterized by the presence of immune complexes, which are composed of antibodies and antigens. The deposition of these immune complexes triggers an inflammatory response, resulting in the accumulation of inflammatory cells, such as neutrophils and macrophages, within the dermal papillae. This accumulation of cells gives rise to the characteristic "rain drop" lesions.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the condition associated with "rain drop" lesions is not a type of vasculitis.
**Option B:** This option is incorrect because the condition associated with "rain drop" lesions is not a type of dermatitis.
**Option C:** This option is incorrect because the condition associated with "rain drop" lesions is not a type of infection.
**Clinical Pearl / High-Yield Fact**
The condition associated with "rain drop" lesions is a classic example of a type III hypersensitivity reaction, in which immune complexes play a central role in the pathogenesis of the disease.
**Correct Answer:** D.