NEET-PG 2020 - Dermatology PYQs Practice Questions

Q: Identify the condition causing this infection on the upper arm

Tinea corporis (body ringworm). ***Tinea corporis (body ringworm)*** - This lesion, depicted on the upper arm, is characteristic of **tinea corporis** due to its **annular, erythematous, and scaly border with central clearing**. - The term "corporis" refers to the **body surface**, excluding the scalp, hands, feet, groin, and nails. *Tinea capitis (scalp ringworm)* - Tinea capitis specifically affects the **scalp** and can present with scaling, hair loss, and inflammation. - The image clearly shows a lesion on the **upper arm**, not the scalp. *Tinea cruris (jock itch)* - Tinea cruris is a fungal infection found in the **groin area**, often extending to the inner thighs and buttocks. - The location of the lesion in the image, on the **upper arm**, rules out tinea cruris. *Tinea manus (hand ringworm)* - Tinea manus affects the **hands**, typically causing dryness, scaling, and sometimes blister formation on the palms or between the fingers. - The lesion in the image is located on the **upper arm**, not the hand. [Practice more Dermatology PYQs on OnCourse]

Q: Elderly man with a long-standing mole on his face that is increasing in size and showing an irregular border. Diagnosis:

Lentigo maligna. ***Lentigo maligna*** - This type of melanoma commonly affects **elderly individuals** and presents as a **slowly enlarging, irregularly bordered, flat or slightly raised pigmented lesion** on sun-exposed areas like the face. - It often has a **long radial growth phase** before progressing to invasive lentigo maligna melanoma. *Superficial spreading melanoma* - While common, it typically presents on the **trunk or extremities** and has a faster growth rate compared to lentigo maligna. - It often appears as a **flat, asymmetrical lesion with varied colors and irregular borders**, but the age and location details point away from this. *Nodular melanoma* - This is an **aggressive form** that grows vertically from the start, presenting as a **dark, raised, often ulcerated nodule** and typically has a shorter history of rapid growth. - It lacks the characteristic long-standing, flat growth pattern described in the elderly patient's face. *Acral melanoma* - This rare type occurs on the **palms, soles, or under the nails (subungual)**, not typically on the face. - It often appears as a **pigmented streak or patch** in these acral locations. [Practice more Dermatology PYQs on OnCourse]

Q: Identify the skin condition depicted in the image.

Ichthyosis. ***Ichthyosis*** - The image clearly displays widespread **dry, scaling, and thickened skin**, consistent with the characteristic presentation of ichthyosis. - This condition is characterized by a defect in **skin barrier function** leading to excessive dryness and accumulation of scales. *Syndromic ichthyosis* - While syndromic ichthyosis also involves skin scaling, it is associated with **additional systemic symptoms** or **organ involvement**, which cannot be determined from this image alone. - The term "ichthyosis" broadly covers this appearance, and without more clinical information, specifying it as syndromic is not the most direct identification. *Leprosy* - Leprosy typically presents with **hypopigmented, anesthetic skin patches** or **nodules**, which are not seen in the image. - The texture and color changes in the image are not characteristic of the primarily neurological and dermatological manifestations of leprosy. *Cutaneous sarcoidosis* - Cutaneous sarcoidosis manifests as **reddish-brown papules, plaques, or nodules**, often on the face, neck, or extremities. - The widespread, fine scaling and dryness seen in the image do not align with the typical granulomatous lesions of sarcoidosis. [Practice more Dermatology PYQs on OnCourse]

Q: A farmer presented with a black mole on the cheek. It increased in size, more than 6mm with irregular borders and a central black lesion, what could be the diagnosis?

Superficial spreading melanoma. ***Superficial spreading melanoma*** - This is the most common type of melanoma and often presents as a **mole with irregular borders**, varying colors, and a diameter greater than 6mm, consistent with the description. - The lesion typically grows **radially** across the skin surface before beginning vertical growth, indicated by the increase in size. *Acral lentigo melanoma* - This type of melanoma primarily affects the **palms, soles, and nail beds**, which is inconsistent with a lesion on the cheek. - It often appears as a **dark brown or black patch** that slowly enlarges, but its location is characteristic. *Lentigo maligna melanoma* - This melanoma typically occurs in **chronically sun-damaged skin** of the elderly, often on the head and neck, but usually presents as a **flat, irregularly shaped, tan or brown patch** with varying shades, which may not fit the description of a central black lesion within a larger mole. - It has a dominant **radial growth phase** and progresses slowly over many years before developing a nodular component. *Nodular melanoma* - This type is characterized by its **rapid vertical growth** and appearance as a **raised, dark, often dome-shaped lesion** from the outset. - While it can be black, the description of an "increased in size" mole with irregular borders and a central black lesion points more towards a spreading type rather than a rapidly growing nodule from the beginning. [Practice more Dermatology PYQs on OnCourse]

Q: Dermatological manifestation of which of the following diseases?

Pellagra. ***Pellagra*** - The image shows **Casal's necklace**, a characteristic **hyperpigmented, scaly, photosensitive rash** around the neck area, which is pathognomonic for pellagra. - Pellagra is caused by **niacin (vitamin B3) deficiency** and presents with the classic "4 D's": **dermatitis**, **diarrhea**, **dementia**, and **death** if untreated. *Acrodermatitis enteropathica* - This is a **hereditary zinc deficiency disorder** that presents with **periorificial and acral dermatitis** (around body openings and extremities). - The skin lesions are typically **vesiculobullous or eczematous** with a different distribution pattern, not the characteristic neck involvement seen here. *Photo dermatitis* - This is a **general term** for skin inflammation caused by **light exposure** and not a specific disease entity. - While pellagra does cause photosensitive dermatitis, photodermatitis alone doesn't explain the specific **necklace-like distribution** and underlying nutritional deficiency. *Vitamin B deficiency* - This option is **too broad** and non-specific, as it encompasses multiple B vitamin deficiencies with different manifestations. - Other B vitamin deficiencies like **B2 (riboflavin)** or **B6 (pyridoxine)** cause **angular cheilitis** and **seborrheic dermatitis**, not the characteristic neck rash of pellagra. [Practice more Dermatology PYQs on OnCourse]

Question 1

Identify the condition causing this infection on the upper arm

Accepted Answer

Tinea corporis (body ringworm)

Answer

Tinea capitis (scalp ringworm)

Answer

Tinea cruris (jock itch)

Answer

Tinea manus (hand ringworm)

Question 2

Elderly man with a long-standing mole on his face that is increasing in size and showing an irregular border. Diagnosis:

Accepted Answer

Lentigo maligna

Answer

Superficial spreading melanoma

Answer

Nodular melanoma

Answer

Acral melanoma

Question 3

Identify the skin condition depicted in the image.

Accepted Answer

Ichthyosis

Answer

Syndromic ichthyosis

Answer

Cutaneous sarcoidosis

Answer

Leprosy

Question 4

A farmer presented with a black mole on the cheek. It increased in size, more than 6mm with irregular borders and a central black lesion, what could be the diagnosis?

Accepted Answer

Superficial spreading melanoma

Answer

Acral lentigo melanoma

Answer

Lentigo maligna melanoma

Answer

Nodular melanoma

Question 5

Dermatological manifestation of which of the following diseases?

Accepted Answer

Pellagra

Answer

Photo dermatitis

Answer

Acrodermatitis enteropathica

Answer

Vitamin B deficiency

Question 6

Baby born with membrane around him at the time of birth. Which of the following conditions is depicted?

Accepted Answer

Lamellar ichthyosis (collodion membrane at birth)

Answer

X-linked ichthyosis (steroid sulfatase deficiency)

Answer

Generalized hyperkeratosis (thickened skin)

Answer

Ichthyosis vulgaris (dry, scaly skin)

Question 7

A female patient presents with multiple sessile lesions on the vulva that do not bleed on touch. What is the most likely diagnosis?

Accepted Answer

Condyloma acuminata

Answer

Molluscum

Answer

Herpes genitalis

Answer

Chancroid

NEET-PG 2020 — Dermatology