**Core Concept**
Heerfordt's disease is a rare form of sarcoidosis characterized by the presence of fever, unilateral uveoparotid fever, and facial paralysis. It is a manifestation of sarcoidosis, a systemic granulomatous disease involving the lungs, lymph nodes, and other organs.

**Why the Correct Answer is Right**
Heerfordt's disease typically presents with a triad of symptoms: fever, bilateral parotid gland enlargement, and anterior uveitis. The correct answer should not be part of this classic triad. The disease is thought to result from the activation of macrophages and the subsequent formation of granulomas, which can lead to the inflammation of various tissues and organs.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because Heerfordt's disease is not typically associated with a skin rash. While sarcoidosis can present with skin manifestations, such as erythema nodosum or lupus pernio, these are not characteristic of Heerfordt's disease.
**Option B:** This option is incorrect because Heerfordt's disease is not typically associated with joint pain. While sarcoidosis can present with musculoskeletal symptoms, such as arthritis or myositis, these are not characteristic of Heerfordt's disease.
**Option C:** This option is incorrect because Heerfordt's disease is not typically associated with gastrointestinal symptoms. While sarcoidosis can present with gastrointestinal symptoms, such as diarrhea or abdominal pain, these are not characteristic of Heerfordt's disease.

**Clinical Pearl / High-Yield Fact**
Heerfordt's disease is a rare manifestation of sarcoidosis that can mimic other conditions, such as parotitis or uveitis. It is essential to consider this diagnosis in patients presenting with a triad of fever, parotid gland enlargement, and anterior uveitis.

**Correct Answer: A.**