Spongiosis is seen in –
**Core Concept**
Spongiosis refers to the intercellular edema seen in the epidermis, which is a characteristic histopathological feature of certain skin conditions. This condition is characterized by the accumulation of fluid within the intercellular spaces of the epidermis, leading to a sponge-like appearance under microscopic examination.
**Why the Correct Answer is Right**
Spongiosis occurs due to the disruption of the intercellular connections between keratinocytes, particularly the desmosomes and the tight junctions. This disruption allows fluid to enter the intercellular spaces, leading to edema. Spongiosis is often seen in conditions such as eczema, contact dermatitis, and psoriasis, which are characterized by inflammation and immune-mediated damage to the skin.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because spongiosis is not typically associated with infections such as impetigo, which are characterized by the presence of bacteria or other pathogens.
**Option B:** This option is incorrect because spongiosis is not a feature of benign skin conditions such as seborrheic keratoses, which are characterized by the presence of benign epithelial proliferations.
**Option C:** This option is incorrect because spongiosis is not a feature of malignant skin conditions such as melanoma, which are characterized by the presence of abnormal melanocytes.
**Clinical Pearl / High-Yield Fact**
Spongiosis is a key histopathological feature of eczema, and it is often accompanied by other changes such as parakeratosis and acanthosis. Recognizing spongiosis under the microscope is an important step in diagnosing skin conditions.
**Correct Answer: D. Spongiosis is a characteristic feature of eczema, and it is often seen in conditions such as atopic dermatitis.**