Psoriasis associated with -hemolytic streptococcal infection?
**Core Concept**
Psoriasis is a chronic inflammatory skin condition characterized by hyperproliferation of keratinocytes, leading to thickened skin scales and erythema. The exact pathogenesis of psoriasis involves a complex interplay between immune cells, keratinocytes, and environmental factors. Certain triggers, such as infections, can precipitate or exacerbate psoriasis in susceptible individuals.
**Why the Correct Answer is Right**
The connection between psoriasis and streptococcal infections lies in the concept of Koebner's phenomenon, where skin trauma or injury, including infections, can trigger psoriatic lesions in individuals with a predisposition to the condition. Streptococcal infections, particularly group A beta-hemolytic streptococcus (GABHS), are known to trigger psoriasis in some cases, possibly due to molecular mimicry between streptococcal antigens and skin antigens. This leads to an autoimmune response and inflammation in the skin.
**Why Each Wrong Option is Incorrect**
* **Option A:** While other infections can trigger psoriasis, the specific association with streptococcal infections is more relevant and well-documented.
* **Option B:** This option is unrelated to the pathogenesis of psoriasis and is not a known trigger for the condition.
* **Option C:** This option is not a recognized association with psoriasis and is therefore an incorrect distractor.
**Clinical Pearl / High-Yield Fact**
Remember that streptococcal infections, particularly GABHS, can trigger psoriasis in susceptible individuals, highlighting the importance of considering a patient's medical history and potential triggers when managing psoriasis.
**Correct Answer:** C.