Changes of squamous cell carcinoma are seen in – a) Seborrhoeic keratosisb) Bowen’s diseasec) Lichen planusd) DLE
## Core Concept
The question assesses knowledge of dermatological conditions associated with an increased risk of or transformation into squamous cell carcinoma (SCC), a type of skin cancer. Squamous cell carcinoma originates from squamous epithelial cells and can arise from pre-malignant lesions or conditions that exhibit squamous cell dysplasia.
## Why the Correct Answer is Right
Bowen's disease is a form of squamous cell carcinoma in situ, meaning it represents an early stage of SCC that has not yet invaded the basement membrane. It is characterized by the presence of atypical squamous cells confined to the epidermis. This condition is a direct precursor to invasive SCC, making option b) Bowen's disease a correct association.
## Why Each Wrong Option is Incorrect
* **Option A: Seborrhoeic keratosis** - While seborrheic keratoses are common benign skin lesions, they are not typically considered premalignant for SCC, although there can be rare cases of malignant transformation.
* **Option C: Lichen planus** - Lichen planus is a chronic inflammatory condition that affects mucous membranes inside the mouth and other areas of the body. While there is some debate about its potential to progress to SCC, especially in the oral form, it is not as directly associated with SCC changes as Bowen's disease.
* **Option D: DLE (Discoid Lupus Erythematosus)** - DLE is a chronic skin condition of sores with inflammation and scarring favoring the face, ears, and scalp but does not have a well-established direct progression to SCC.
## Clinical Pearl / High-Yield Fact
A key point to remember is that Bowen's disease is a carcinoma in situ and has the potential to progress to invasive SCC if left untreated. Early recognition and treatment can prevent progression.
## Correct Answer: B.