Dermatophyte infection is –
**Core Concept**
Dermatophyte infections, also known as tinea infections, are a type of fungal infection that affects the skin, hair, and nails. These infections are caused by a group of fungi called dermatophytes, which obtain their nutrients by breaking down keratin, a protein found in skin cells.
**Why the Correct Answer is Right**
Dermatophyte infections occur when the fungus penetrates the skin, hair, or nail and begins to break down keratin. This process is facilitated by the enzyme keratinase, which is produced by the dermatophyte. The fungus then absorbs the broken-down keratin, causing damage to the affected area. Dermatophyte infections can be treated with antifungal medications that inhibit the production of keratinase or interfere with the fungus's ability to absorb keratin.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the characteristics of dermatophyte infections.
**Option B:** This option is incorrect because it is too broad and does not specifically refer to dermatophyte infections.
**Option C:** This option is incorrect because it is not a recognized term in the context of dermatophyte infections.
**Clinical Pearl / High-Yield Fact**
Dermatophyte infections can be classified into different types based on the location of the infection, including tinea corporis (body), tinea pedis (feet), tinea cruris (groin), tinea capitis (scalp), and tinea unguium (nails).
**Correct Answer: D. Cutaneous fungal infection caused by dermatophytes.**