Chemical Peels Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Chemical Peels. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Chemical Peels Indian Medical PG Question 1: Which of the following are treatment options for acne vulgaris?
- A. Isotretinoin
- B. All of the options (Correct Answer)
- C. Topical erythromycin
- D. Oral Minocycline
Chemical Peels Explanation: ***All of the options***
- All listed options (Isotretinoin, Topical erythromycin, and Oral Minocycline) are well-established and commonly used **treatment options for acne vulgaris**, depending on the severity and type of acne.
- The choice of treatment often follows a stepped approach, starting with topical agents for mild to moderate acne and progressing to oral medications like antibiotics or isotretinoin for more severe or resistant cases.
*Isotretinoin*
- **Isotretinoin** is a powerful oral retinoid primarily used for **severe, recalcitrant nodular acne** that has not responded to other treatments.
- It works by reducing sebum production, follicular hyperkeratinization, inflammation, and the growth of *P. acnes*.
*Topical erythromycin*
- **Topical erythromycin** is an **antibiotic** used to treat mild to moderate inflammatory acne by reducing the growth of *Cutibacterium acnes* (formerly *Propionibacterium acnes*) and decreasing inflammation.
- It is often combined with other topical agents like benzoyl peroxide to minimize the development of **antibiotic resistance**.
*Oral Minocycline*
- **Oral minocycline** is a **tetracycline antibiotic** used for moderate to severe inflammatory acne.
- It reduces bacterial populations on the skin and exhibits **anti-inflammatory properties**, making it effective for widespread or deeper lesions.
Chemical Peels Indian Medical PG Question 2: Most common side effect of retinoids is
- A. Headache
- B. Diarrhoea
- C. Photosensitivity
- D. Mucocutaneous dryness (Correct Answer)
Chemical Peels Explanation: ***Mucocutaneous dryness***
- This is the **most common side effect** of retinoids, particularly oral isotretinoin, occurring in nearly all patients
- Manifests as **cheilitis** (dry, cracked lips), **xerosis** (dry skin), **dry nasal mucosa**, and **conjunctival dryness**
- Direct result of decreased sebaceous gland activity and altered epithelial differentiation
- Managed with **emollients and lip balm**
*Headache*
- Can occur with retinoid use, but less common than mucocutaneous effects
- **Severe headaches** with visual changes may indicate **pseudotumor cerebri** (benign intracranial hypertension), a rare but serious complication requiring immediate discontinuation
*Diarrhoea*
- **Gastrointestinal side effects** are uncommon with systemic retinoids
- Not a characteristic adverse effect of this drug class
*Photosensitivity*
- While retinoids can increase susceptibility to **sunburn**, this is not the most common side effect
- Patients should be advised to use **sunscreen** and avoid excessive sun exposure
- Less universal than mucocutaneous dryness
Chemical Peels Indian Medical PG Question 3: Which of the following is the platinum-based chemotherapeutic agent used as first-line treatment for ovarian carcinoma?
- A. Cyclophosphamide
- B. Methotrexate
- C. Cisplatin (Correct Answer)
- D. Dacarbazine
Chemical Peels Explanation: ***Cisplatin***
- **Cisplatin** is a platinum-based chemotherapy drug that forms **DNA cross-links**, inhibiting DNA synthesis and leading to the death of rapidly dividing cells, making it highly effective against **ovarian carcinoma**.
- It is a cornerstone of chemotherapy regimens for ovarian cancer, often used in combination with other agents such as paclitaxel.
*Methotrexate*
- **Methotrexate** is an **antimetabolite** that inhibits dihydrofolate reductase, thereby interfering with DNA synthesis.
- While it is used in various cancers like leukemia, lymphoma, and some solid tumors (e.g., breast cancer, gestational trophoblastic disease), it is **not a primary recommended drug for ovarian carcinoma**.
*Cyclophosphamide*
- **Cyclophosphamide** is an **alkylating agent** that causes DNA damage, leading to cell death.
- It is used in many cancers, including lymphoma, breast cancer, and some leukemias, but it is **not a first-line or primary agent for ovarian carcinoma** in contemporary treatment guidelines.
*Dacarbazine*
- **Dacarbazine** is an **alkylating agent** primarily used in the treatment of **malignant melanoma** and Hodgkin lymphoma.
- It is **not indicated for the treatment of ovarian carcinoma**.
Chemical Peels Indian Medical PG Question 4: Microabrasion using modified Croll technique utilizes:
- A. 5% HF
- B. 37% Phosphoric Acid
- C. 10% HCl
- D. 18% Citric acid (Correct Answer)
Chemical Peels Explanation: ***18% Citric acid***
- The modified Croll technique for **microabrasion** specifically utilizes an 18% solution of **citric acid**.
- This technique is effective for removing superficial enamel discolorations and opacities by gently abrading the affected surface.
*5% HF*
- **Hydrofluoric acid (HF)** is a highly corrosive acid primarily used by **dental technicians** for etching ceramic restorations, not for in-office microabrasion on natural teeth.
- Due to its extreme toxicity and potential for severe tissue damage, HF is generally not used intraorally for enamel procedures.
*37% Phosphoric Acid*
- **37% phosphoric acid** is routinely used in dentistry as an **etchant** to prepare enamel and dentin surfaces for bonding procedures, creating a microporous surface for resin penetration.
- Its mechanism is to demineralize the tooth surface to enhance adhesion, not to mechanically abrade or remove superficial stains in the same manner as microabrasion.
*10% HCl*
- While hydrochloric acid (HCl) was historically used in earlier microabrasion techniques, the **modified Croll technique** specifically moved to **citric acid** due to its gentler nature and reduced potential for adverse effects on tooth structure compared to stronger acids.
- Stronger concentrations of HCl can be more aggressive and carry a higher risk of excessive enamel removal or chemical burns if not carefully controlled.
Chemical Peels Indian Medical PG Question 5: A 35 years old female presented with acne. She was treated for her acne but after the treatment, she developed pigmentation. Which drug is responsible for hyperpigmentation?
- A. Minocycline (Correct Answer)
- B. Doxycycline
- C. Tetracycline
- D. Erythromycin
Chemical Peels Explanation: ***Minocycline***
- **Minocycline** is known to cause different types of hyperpigmentation, including blue-grey discoloration of the skin, scars, mucosa, eyes, and teeth, especially with long-term use.
- This pigmentation can be due to the accumulation of **iron oxide** and **minocycline degradation products** in tissues.
*Doxycycline (a tetracycline antibiotic)*
- While doxycycline is a tetracycline, it is **less commonly associated with significant hyperpigmentation** compared to minocycline.
- It can cause photosensitivity, which might lead to hyperpigmentation in sun-exposed areas, but direct drug-induced blue-grey discoloration is rare.
*Tetracycline (a tetracycline antibiotic)*
- **Tetracycline** can cause tooth discoloration, especially in children, and photosensitivity, but direct drug-induced skin hyperpigmentation as described is **less common** than with minocycline.
- Other side effects like gastrointestinal upset are more prominent.
*Erythromycin (a macrolide antibiotic)*
- **Erythromycin** is a macrolide antibiotic and is **not typically associated with significant skin hyperpigmentation** as a side effect.
- Common side effects include gastrointestinal disturbances like nausea, vomiting, and diarrhea.
Chemical Peels Indian Medical PG Question 6: A girl about to marry has comedonal acne. Drug to treat such a case is:
- A. Topical antibiotic
- B. Retinoids (Correct Answer)
- C. Estrogen
- D. Benzoyl peroxide
Chemical Peels Explanation: ***Retinoids***
- **Topical retinoids** (e.g., tretinoin, adapalene) are the cornerstone of comedonal acne treatment as they normalize follicular keratinization, preventing the formation of microcomedones and promoting their expulsion.
- They work by **reducing hyperkeratinization** and the adhesion of epidermal cells within the follicle, which directly targets the underlying pathology of comedonal acne.
*Topical antibiotic*
- Topical antibiotics (e.g., clindamycin, erythromycin) primarily target the **bacterial component** of acne, specifically *Cutibacterium acnes*, and have anti-inflammatory effects.
- They are less effective for purely **comedonal acne**, which lacks significant inflammatory lesions or bacterial overgrowth as the primary issue.
*Estrogen*
- Estrogen, often combined with progestin in **oral contraceptives**, can treat acne by reducing androgen levels and thus decreasing sebum production.
- This is typically used for **hormonal acne** with inflammatory lesions, and it is not the first-line treatment for purely comedonal acne.
*Benzoyl peroxide*
- **Benzoyl peroxide** is an antimicrobial agent and has comedolytic properties, meaning it helps to shed dead skin cells and prevent clogged pores.
- While it has some benefit, it is often more effective for **inflammatory acne** due to its antimicrobial action and is secondary to retinoids for primary comedonal treatment.
Chemical Peels Indian Medical PG Question 7: What is the most appropriate topical treatment for external genital warts in pregnancy?
- A. 5-Fluorouracil cream
- B. Imiquimod cream
- C. Podophyllin resin
- D. Trichloroacetic acid (TCA) (Correct Answer)
Chemical Peels Explanation: ***Trichloroacetic acid (TCA)***
- **TCA** is a caustic agent that **chemically ablates** warts and is considered safe for use in **pregnancy** as it is not systemically absorbed.
- It works by **denaturing proteins** and causing necrosis of the wart tissue, leading to its destruction.
*5-Fluorouracil cream*
- **5-Fluorouracil** is an **antineoplastic agent** that inhibits cell proliferation and DNA synthesis.
- It is **contraindicated in pregnancy** due to potential **teratogenic effects** on the fetus.
*Imiquimod cream*
- **Imiquimod** is an **immune response modifier** that stimulates interferon and cytokine production.
- It is **not recommended in pregnancy** due to **insufficient safety data** regarding its systemic absorption and potential effects on fetal development.
*Podophyllin resin*
- **Podophyllin** is a **cytotoxic agent** that inhibits cell division and causes tissue necrosis.
- It is **contraindicated in pregnancy** due to significant **systemic absorption** and high risk of **fetal toxicity and teratogenicity**.
Chemical Peels Indian Medical PG Question 8: Which of the following is not true about hydroquinone?
- A. Response is incomplete and pigmentation may recur
- B. It inhibits tyrosinase
- C. It requires prescription strength concentrations above 2%
- D. It should not be used for melasma or chloasma of pregnancy (Correct Answer)
Chemical Peels Explanation: ***It should not be used for melasma or chloasma of pregnancy***
- This statement is **NOT TRUE** - hydroquinone is actually a **first-line treatment for melasma** including chloasma (melasma of pregnancy)
- Hydroquinone 2-4% is one of the **most effective topical agents** for treating melasma and is widely recommended in dermatological guidelines
- While hydroquinone use during **active pregnancy** is approached with caution (FDA Category C), it is definitely indicated for treating melasma/chloasma **after pregnancy** and for general melasma in non-pregnant patients
- The condition (melasma/chloasma) is appropriately treated with hydroquinone; only the **timing during pregnancy** requires consideration
*Response is incomplete and pigmentation may recur*
- This is a **TRUE statement** about hydroquinone therapy
- Treatment response is often **incomplete** with partial lightening of hyperpigmentation
- **Recurrence is common** after discontinuation, especially with continued sun exposure or hormonal triggers
- Maintenance therapy is often needed to sustain results
*It inhibits tyrosinase*
- This is a **TRUE statement** - hydroquinone's primary mechanism of action
- Acts as a **competitive inhibitor of tyrosinase**, the rate-limiting enzyme in melanin synthesis
- This inhibition reduces melanin production in melanocytes, leading to depigmentation
*It requires prescription strength concentrations above 2%*
- This is a **TRUE statement** in most countries including India and the USA
- Hydroquinone concentrations **≤2%** are available over-the-counter (OTC)
- Concentrations **>2% (typically 3-4%)** require a prescription
- Higher concentrations provide greater efficacy but also increased risk of side effects like ochronosis
Chemical Peels Indian Medical PG Question 9: Potato nose is seen in ?
- A. Acne vulgaris
- B. Rhinosporoidosis
- C. Acne rosacea (Correct Answer)
- D. Lupus vulgaris
Chemical Peels Explanation: ***Acne rosacea***
- **Potato nose**, also known as **rhinophyma**, is a severe manifestation of **acne rosacea**, characterized by thickened, red, and bumpy skin on the nose.
- This condition results from **hyperplasia of sebaceous glands** and connective tissue in the nose, leading to its characteristic bulbous appearance.
*Acne vulgaris*
- This common skin condition is characterized by **comedones**, **papules**, **pustules**, and sometimes cysts, primarily on the face, chest, and back.
- It does **not typically cause rhinophyma** or significant thickening of nasal skin.
*Rhinosporoidosis*
- This is a **chronic granulomatous fungal infection** affecting mucous membranes, particularly the nose.
- While it can cause nasal polyps and masses, it does **not result in the sebaceous gland hyperplasia** and thickened skin characteristic of rhinophyma.
*Lupus vulgaris*
- Lupus vulgaris is a chronic and progressive form of **cutaneous tuberculosis**, often affecting the face.
- It presents with **reddish-brown plaques** and nodules that can ulcerate and scar but does **not lead to the specific nasal hypertrophy** seen in rhinophyma.
Chemical Peels Indian Medical PG Question 10: Identify the lesion: (Recent NEET Pattern 2016-17)
- A. Erythema multiforme (Correct Answer)
- B. Gianotti-Crosti syndrome
- C. Pityriasis rosea
- D. Acne rosacea
Chemical Peels Explanation: ***Erythema multiforme***
- The image displays characteristic **targetoid lesions** with multiple concentric rings of color (erythema, edema, pallor), typical of **erythema multiforme**.
- These lesions often appear suddenly, symmetrically, and commonly on the extremities, often triggered by infections (e.g., **herpes simplex virus**) or medications.
*Gianotti-Crosti syndrome*
- Characterized by **monomorphic, flesh-colored to erythematous papules** and papulovesicles, often on the cheeks, buttocks, and extensor surfaces of the limbs.
- This condition is typically observed in **children** after viral infections and does not usually present with target lesions.
*Pityriasis rosea*
- Starts with a single **"herald patch,"** followed by smaller, oval, pinkish-red patches with fine scales, often arranged in a **"Christmas tree pattern"** on the trunk.
- The morphology of the lesions in the image, specifically the targetoid appearance, is not consistent with pityriasis rosea.
*Acne rosacea*
- Marked by **facial erythema**, papules, pustules, and telangiectasias, primarily affecting the central face.
- It does not present with the widespread, distinct target lesions seen in the image.
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