**Question:** Regarding cutaneous amoebiasis which is not true?

A. Amoebiasis is a common parasitic infection in tropical regions.
B. The causative agent is the protozoan Entamoeba histolytica.
C. The infection primarily affects the digestive system.
D. Clinical manifestations of amoebiasis include abdominal pain and diarrhea.

**Correct Answer:**

**Core Concept:** Cutaneous amoebiasis refers to the infection caused by Entamoeba histolytica, a protozoan that primarily affects the gastrointestinal tract. In some cases, the infection can spread to other parts of the body, including the skin, leading to cutaneous manifestations.

**Why the Correct Answer is Right:**

Option A is true as amoebiasis is indeed a common parasitic infection, predominantly in tropical regions. However, the focus of this question is on cutaneous amoebiasis, which occurs when the infection spreads to other parts of the body, including the skin.

Option B is correct as E. histolytica is the causative agent responsible for amoebiasis.

Option C is incorrect as, although the primary infection affects the gastrointestinal tract, cutaneous manifestations can occur as a result of the infection spreading to other parts of the body.

Option D is partially correct, as abdominal pain and diarrhea are common symptoms of amoebiasis, but the question specifically asks about cutaneous manifestations. Cutaneous symptoms may include skin lesions, ulcers, and abscesses.

**Why Each Wrong Option is Incorrect:**

Option A is incorrect because, while amoebiasis is prevalent in tropical regions, the question focuses on cutaneous manifestations, which are not limited to these regions.

Option B is wrong because cutaneous amoebiasis is a result of the infection spreading to other parts of the body, not directly due to E. histolytica causing cutaneous symptoms.

Option C is incorrect because, although the primary infection affects the gastrointestinal tract, cutaneous manifestations can occur as a result of the infection spreading to other parts of the body.

Option D is only partially correct because cutaneous manifestations are not the primary focus of abdominal pain and diarrhea. The question asks about skin symptoms, which may include skin lesions, ulcers, and abscesses.

**Clinical Pearls:**

1. Cutaneous amoebiasis is a manifestation of the systemic spread of Entamoeba histolytica infection to the skin.
2. The key is to understand that cutaneous symptoms are not limited to tropical regions but may appear in patients from any geographical area.
3. Cutaneous manifestations should be distinguished from other skin diseases that may present with similar symptoms, such as dermatitis or fungal infections, and only confirm the diagnosis through serological tests or stool examination.
4. When examining a patient with skin lesions, be aware of the possibility of cutaneous amoebiasis, especially in patients returning from endemic areas or with a history of contact with contaminated water or soil.