Dermatological Procedures Practice Questions

Q: Which of the following are correct for managing hypertrophic scars? 1. Silicone gel sheeting 2. Intralesional steroid injections 3. Vitamin A gel applications 4. Laser treatment Select the answer using the code given below.

1, 2 and 4. ***1, 2 and 4*** - **Silicone gel sheeting**, **intralesional steroid injections**, and **laser treatment** are all established and effective methods for managing hypertrophic scars. - Silicone gel helps to hydrate the scar, reduce collagen synthesis, and decrease itching, while steroids reduce inflammation and collagen production, and lasers can help to improve scar texture and color. *1, 3 and 4* - This option incorrectly includes **Vitamin A gel applications** as a primary treatment. While retinoids can have some skin benefits, they are not a first-line or well-established treatment for hypertrophic scars. - **Silicone gel sheeting** and **laser treatment** are indeed effective, but the inclusion of Vitamin A makes this option less accurate. *1, 2 and 3* - This option also incorrectly includes **Vitamin A gel applications**. While **silicone gel sheeting** and **intralesional steroid injections** are effective, Vitamin A is not a standard treatment for hypertrophic scars. - The primary methods for managing hypertrophic scars focus on reducing collagen production and inflammation, which Vitamin A gel does not effectively address in this context. *2, 3 and 4* - This option correctly includes **intralesional steroid injections** and **laser treatment**, but it again incorrectly includes **Vitamin A gel applications** and omits **silicone gel sheeting**, which is a widely recommended and often first-line treatment. - Omitting **silicone gel sheeting** significantly weakens the effectiveness of this combination as a comprehensive management strategy.

Q: Match the following woods lamp findings: 1. Erythrasma, 2. Pityriasis versicolor, 3. Tinea capitis, 4. Vitiligo || a. Yellow b. Coral red fluorescence c. Pink d. Green e. Milky white

1-b, 2-a, 3-d, 4-e. ***1-b, 2-a, 3-d, 4-e*** - **Erythrasma** is caused by *Corynebacterium minutissimum* and produces **porphyrins** that fluoresce **coral red** under a Wood's lamp [1]. - **Pityriasis versicolor** is caused by *Malassezia furfur* and typically fluoresces **yellow to yellowish-green** [2]. - **Tinea capitis** (especially due to *Microsporum* species) shows **green fluorescence** of infected hairs. - **Vitiligo** lesions, due to a complete absence of melanin, appear as **milky white** or bright white areas under a Wood's lamp [3]. *1-d, 2-a, 3-c, 4-e* - This option incorrectly states that Erythrasma fluoresces green. Green fluorescence is characteristic of *Microsporum* species causing **Tinea capitis**. - Additionally, Tinea capitis is incorrectly associated with pink fluorescence, which is not a typical finding. *1-a, 2-c, 3-e, 4-d* - This option incorrectly states that Erythrasma fluoresces yellow. Yellow fluorescence is associated with **Pityriasis versicolor** [2]. - It also incorrectly assigns milky white fluorescence to Tinea capitis and green fluorescence to Vitiligo. *1-b, 2-d, 3-a, 4-c* - This option incorrectly associates Pityriasis versicolor with green fluorescence. While some variations exist, **yellow** is the more characteristic finding [2]. - It also incorrectly links Tinea capitis to yellow fluorescence and Vitiligo to pink, which are not typical Wood's lamp findings for these conditions.

Q: Wood's lamp is not used for diagnosing:

Lichen planus. ***Lichen planus*** - **Wood's lamp** is generally not used for diagnosing **lichen planus** as the lesions typically do not fluoresce. - Diagnosis of lichen planus relies on its characteristic **violaceous, polygonal, pruritic papules and plaques** and often confirmed by **biopsy**. *Pityriasis versicolor* - **Wood's lamp** is useful for **pityriasis versicolor**, causing it to fluoresce a **yellowish-green or coppery-orange** color due to metabolic byproducts of *Malassezia* fungi. - This characteristic fluorescence helps in differentiating lesions from other skin conditions and in identifying subclinical involvement. *Porphyria* - **Wood's lamp** can be used to detect **reddish-pink fluorescence of urine** or skin in patients with **porphyria cutanea tarda** due to the accumulation of porphyrins. - This fluorescence is a key diagnostic indicator in certain types of **porphyria**, particularly those affecting the skin. *Vitiligo* - **Wood's lamp** enhances the contrast between depigmented and normally pigmented skin, making **vitiligo** lesions appear **bright bluish-white** due to the absence of melanin. - It is particularly useful for detecting subtle or small lesions of **vitiligo**, especially in individuals with lighter skin tones.

Q: Diascopy is very helpful in the diagnosis of:

All of the options. ***All of the options*** - Diascopy is a diagnostic technique using a glass slide to apply pressure on skin lesions, helping differentiate between **vascular (erythematous)** and **non-vascular lesions** and revealing underlying pathology. - It is particularly helpful in diagnosing **lupus vulgaris**, **cutaneous vasculitis**, and **nevus anaemicus**. *Lupus vulgaris* - Shows pathognomonic **apple-jelly nodules** on diascopy due to granulomatous inflammation. - When pressed with a glass slide, the lesion reveals a characteristic **translucent yellowish-brown ("apple jelly") color** from tuberculoid granulomas. *Cutaneous vasculitis* - Diascopy differentiates **purpura (extravasated blood)** from simple erythema. - **Non-blanching purpura** indicates intravascular hemorrhage from vessel wall damage, a key feature of vasculitis. - Blanching erythema would suggest vasodilation rather than true vasculitis. *Nevus anaemicus* - Diascopy causes the pale lesion to **disappear or blend** with surrounding blanched normal skin. - This occurs because normal surrounding vessels constrict under pressure, matching the baseline pale appearance of the nevus. - This helps distinguish it from other hypopigmented lesions like vitiligo (which remains visible on diascopy).

Q: Chemical peeling is indicated in all of the following except

Lichen planus. ***Lichen planus*** - Chemical peels are generally **contraindicated** in active inflammatory conditions like **lichen planus**, as they can worsen the inflammation or trigger a Koebner phenomenon. - While chemical peels can address post-inflammatory hyperpigmentation, they should not be used during the active phase of lichen planus due to the risk of exacerbation. *Melasma* - **Melasma** is a common indication for chemical peels, particularly superficial and medium-depth peels, to reduce hyperpigmentation. - Peels containing agents like **glycolic acid**, salicylic acid, or trichloroacetic acid are often used to lighten melanin deposits. *Acne vulgaris* - Chemical peels are effective in treating **acne vulgaris** by exfoliating the skin, reducing comedones, and improving overall skin texture. - **Salicylic acid peels** are particularly useful due to their lipophilic nature, allowing them to penetrate and clean pores. *Photoaging* - **Photoaging**, characterized by fine lines, wrinkles, and dyspigmentation from sun exposure, is a primary indication for chemical peels. - Peels can promote **collagen remodeling** and help achieve a more even skin tone and smoother texture.

Q: Chemical peeling is done by all except -

Phosphoric acid. ***Phosphoric acid*** - **Phosphoric acid** is primarily used in **dentistry as an etching agent** for dental restorations and in food as an additive for tartness, **NOT for chemical peels**. - It does not possess the dermatological exfoliating or regenerating properties required for chemical peeling. - Standard chemical peeling agents include **glycolic acid, salicylic acid, TCA, and phenol**. *Trichloroacetic acid (TCA)* - **TCA** is a well-established agent used for **medium to deep chemical peels**, depending on concentration (10-50%). - It works by **coagulating epidermal and dermal proteins**, leading to controlled skin exfoliation and regeneration. *Carbolic acid (Phenol)* - **Carbolic acid (phenol)** is used for **deep chemical peels** (Baker-Gordon peel), particularly for severe photoaging, deep wrinkles, and scars. - It causes protein denaturation and deep dermal necrosis, leading to substantial exfoliation and collagen remodeling. *Kojic acid* - **Kojic acid** is primarily a **skin-lightening agent** that inhibits tyrosinase enzyme, reducing melanin production for treating hyperpigmentation. - While it may be incorporated into some topical formulations, **it is NOT a chemical peeling agent** — it does not cause controlled skin necrosis or exfoliation like true peeling agents (TCA, phenol, glycolic acid, salicylic acid). - Some sources may mention its use in superficial peels, but it is NOT considered a standard chemical peeling agent in dermatological practice.

Q: Which of the following are side effects of using argon laser?

All of the options. ***All of the options*** - **Argon laser** targets hemoglobin and melanin, making it effective for vascular lesions but also carries a risk of pigmentary changes, scar formation, and local tissue reactions. - **Hypopigmentation**, **crusting**, and **keloid formation** are all recognized potential side effects due to its thermal destructive mechanism. *Hypopigmentation* - This side effect occurs due to the **non-selective absorption** of argon laser energy by **melanin** in the epidermis, leading to destruction of melanocytes. - It results in lighter patches of skin in the treated area, especially problematic in darker skin types. *Crusting* - **Crusting** is a common immediate post-treatment effect following argon laser therapy, caused by tissue damage and subsequent inflammation and exudation. - It indicates surface epithelial damage and typically resolves as the skin heals, but proper wound care is essential to prevent infection. *Keloid formation* - **Keloid formation** is a risk with argon laser treatment, particularly in individuals prone to abnormal scarring. - The thermal injury caused by the laser can trigger an exaggerated wound healing response, leading to raised, fibrous scars that extend beyond the original treated area.

Q: Compare the following treatment modalities for actinic keratoses: 1. Cryotherapy a. Field treatment, high clearance 2. 5-fluorouracil b. Targets single lesions 3. Photodynamic therapy c. Requires multiple office visits

1-b, 2-a, 3-c. ***1-b, 2-a, 3-c*** - This option correctly matches **cryotherapy** with targeting **single lesions**, **5-fluorouracil** with **field treatment** and **high clearance**, and **photodynamic therapy** with requiring **multiple office visits**. - **Cryotherapy** is a localized treatment, **5-fluorouracil** is applied broadly to treat multiple lesions, and **PDT** involves an initial sensitizer application followed by light exposure. *1-a, 2-b, 3-c* - This option incorrectly states **cryotherapy** as a field treatment with high clearance because **cryotherapy** is primarily used for **individual lesions**. - It also inaccurately assigns **5-fluorouracil** to targeting single lesions, as **5-FU** is known for its effectiveness as a **field treatment**. *1-b, 2-c, 3-a* - This option incorrectly associates **5-fluorouracil** with requiring multiple office visits. While it is applied over several days or weeks, these are typically at-home treatments, not numerous in-office visits. - It also incorrectly matches **photodynamic therapy** with field treatment and high clearance, whereas while PDT is a field treatment, its clearance rates can vary, and it usually requires multiple visits. *1-c, 2-a, 3-b* - This response inaccurately suggests that **cryotherapy** requires multiple office visits, when in fact it is often a **single-session treatment** per lesion. - It also wrongly correlates **photodynamic therapy** with targeting single lesions, as **PDT** is typically applied over a **broader area** for field treatment.

Q: What is the best method to treat a large port-wine stain?

Pulsed dye laser. ***Pulsed dye laser*** - The **pulsed dye laser (PDL)** is considered the **gold standard** for treating port-wine stains due to its specific targeting of hemoglobin in the dilated capillaries without damaging surrounding tissue. - This treatment involves multiple sessions to progressively lighten the stain and prevent complications such as **nodularity** and **tissue hypertrophy**. *Radiotherapy* - **Radiotherapy** is generally not recommended for port-wine stains due to its potential for **scarring**, **pigment changes**, and risk of **malignancy**. - It is an aggressive treatment typically reserved for **cancerous conditions** or severe proliferative vascular lesions not amenable to other treatments. *Tattooing* - **Tattooing** involves injecting skin-colored pigments into the lesion to camouflage it, but it does not treat the underlying vascular abnormality. - This method can result in an **artificial appearance**, **uneven coverage**, and potential for **allergic reactions** or infections. *Excision with skin grafting* - **Surgical excision** of a large port-wine stain would result in a **significant scar** and require **skin grafting**, which carries risks of graft failure, poor aesthetic outcome, and color mismatch. - This method is generally reserved for very small, localized lesions or those with significant **nodular hypertrophy** that cannot be effectively managed by laser therapy.

Q: What is the first-line treatment for melasma?

Topical hydroquinone. ***Topical hydroquinone*** - **Topical hydroquinone** (2-4%) is the **most effective single-agent treatment** among the given options, serving as the gold standard for melasma by inhibiting **tyrosinase enzyme** and melanin production. - Demonstrates **highest efficacy rates** (60-80% improvement) when combined with strict sun protection, making it both first-line and most effective monotherapy choice. *Laser therapy* - Carries **high risk of paradoxical darkening** and post-inflammatory hyperpigmentation, especially in darker skin types common in melasma patients. - Requires **specialized expertise** and should only be considered as adjunctive therapy after optimizing topical treatments, not as primary treatment. *Chemical peels* - Provide **variable and inconsistent results** as monotherapy, typically requiring multiple sessions with unpredictable outcomes. - Risk of **post-inflammatory hyperpigmentation** particularly in Fitzpatrick skin types IV-VI, making them less reliable than hydroquinone. *Microdermabrasion* - Offers only **superficial exfoliation** with minimal clinical improvement in melasma pigmentation. - May actually **worsen pigmentation** through mechanical irritation and is not recommended in evidence-based treatment guidelines.

Question 1

Which of the following are correct for managing hypertrophic scars?

1. Silicone gel sheeting
2. Intralesional steroid injections
3. Vitamin A gel applications
4. Laser treatment Select the answer using the code given below.

Accepted Answer

1, 2 and 4

Answer

1, 3 and 4

Answer

1, 2 and 3

Answer

2, 3 and 4

Question 2

Match the following woods lamp findings: 1. Erythrasma, 2. Pityriasis versicolor, 3. Tinea capitis, 4. Vitiligo || a. Yellow  b. Coral red fluorescence c. Pink  d. Green e. Milky white

Accepted Answer

1-b, 2-a, 3-d, 4-e

Answer

1-d, 2-a, 3-c, 4-e

Answer

1-a, 2-c, 3-e, 4-d

Answer

1-b, 2-d, 3-a, 4-c

Question 3

Wood's lamp is not used for diagnosing:

Accepted Answer

Lichen planus

Answer

Pityriasis versicolor

Answer

Porphyria

Answer

Vitiligo

Question 4

Diascopy is very helpful in the diagnosis of:

Accepted Answer

All of the options

Answer

Lupus vulgaris

Answer

Cutaneous vasculitis

Answer

Nevus anaemicus

Question 5

Chemical peeling is indicated in all of the following except

Accepted Answer

Lichen planus

Answer

Melasma

Answer

Acne vulgaris

Answer

Photoaging

Question 6

Chemical peeling is done by all except -

Accepted Answer

Phosphoric acid

Answer

Trichloroacetic acid

Answer

Carbolic acid

Answer

Kojic acid

Question 7

Which of the following are side effects of using argon laser?

Accepted Answer

All of the options

Answer

Hypopigmentation

Answer

Crusting

Answer

Keloid formation

Question 8

Compare the following treatment modalities for actinic keratoses:
1. Cryotherapy a. Field treatment, high clearance
2. 5-fluorouracil b. Targets single lesions
3. Photodynamic therapy c. Requires multiple office visits

Accepted Answer

1-b, 2-a, 3-c

Answer

1-a, 2-b, 3-c

Answer

1-b, 2-c, 3-a

Answer

1-c, 2-a, 3-b

Question 9

What is the best method to treat a large port-wine stain?

Accepted Answer

Pulsed dye laser

Answer

Radiotherapy

Answer

Excision with skin grafting

Answer

Tattooing

Question 10

What is the first-line treatment for melasma?

Accepted Answer

Topical hydroquinone

Answer

Laser therapy

Answer

Chemical peels

Answer

Microdermabrasion

Dermatological Procedures — MCQs

Dermatological Procedures — MCQs

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