Occupational Dermatoses

Occupational Dermatoses Indian Medical PG Question 1: What is the primary condition for which calcitriol is used as a treatment?

• A. Pemphigus
• B. Secondary hyperparathyroidism (Correct Answer)
• C. Lichen planus
• D. Leprosy

Occupational Dermatoses Explanation: Secondary hyperparathyroidism - Calcitriol is the active form of vitamin D (1,25-dihydroxyvitamin D₃), and it is crucial for regulating calcium and phosphate levels in the body [1]. - In secondary hyperparathyroidism, often seen in chronic kidney disease (CKD), the kidneys cannot convert vitamin D to its active form, leading to hypocalcemia and increased PTH secretion [1], [2]. - Calcitriol supplementation helps to increase calcium absorption from the gut and suppress the release of parathyroid hormone (PTH), thereby treating the underlying cause of secondary hyperparathyroidism [1], [2]. - This is the primary therapeutic indication for calcitriol in clinical practice. Lichen planus - This is a chronic inflammatory condition affecting the skin, hair, nails, and mucous membranes - Typically treated with corticosteroids or other immunosuppressants - Calcitriol has no primary role in the treatment of lichen planus; its therapeutic applications are predominantly related to calcium and bone metabolism Pemphigus - Pemphigus is a group of rare autoimmune blistering diseases that affect the skin and mucous membranes - Primary treatment involves immunosuppressants like corticosteroids, often in high doses - Calcitriol is not indicated for the treatment of pemphigus, as its mechanism of action is unrelated to the autoimmune processes characteristic of this disease Leprosy - Leprosy is a chronic infectious disease caused by the bacterium Mycobacterium leprae - Treated with multi-drug therapy (MDT), which includes antibiotics like rifampicin, dapsone, and clofazimine - Calcitriol is not an antibiotic and therefore has no role in treating the bacterial infection responsible for leprosy

Occupational Dermatoses Indian Medical PG Question 2: Which of the following burn cases requires IMMEDIATE referral to a specialized burn center?

• A. 25% superficial burn in adult
• B. Burn in palm
• C. 10% superficial burn in child
• D. 25% deep burn in adult (Correct Answer)
• E. 5% superficial scald in adult

Occupational Dermatoses Explanation: ***25% deep burn in adult*** - A **deep burn** (full thickness or deep partial thickness) covering **greater than 10% TBSA** is an **absolute criterion** for immediate referral to a specialized burn center per ABA guidelines. - This is due to the high risk of **complications**, need for specialized **wound care**, and potential for **surgical intervention** like skin grafting. - The **combination of depth and extent** makes this the most urgent scenario requiring immediate specialized care. *25% superficial burn in adult* - **Superficial burns** (first-degree) involve only the epidermis and typically heal within days without scarring. - While 25% TBSA is extensive, **superficial burns** can often be managed with supportive care and do not meet the depth criterion for mandatory burn center referral. *Burn in palm* - **Burns involving hands** are considered **special areas** and typically require burn center evaluation for optimal functional outcomes. - However, without specification of **depth and extent**, a small superficial palm burn may be managed locally initially, whereas the question asks for IMMEDIATE referral. - The **25% deep burn** takes precedence due to its life-threatening nature and clear-cut indication. *10% superficial burn in child* - For children, burns greater than **10% TBSA** warrant consideration for burn center referral due to higher morbidity risk. - However, **superficial burns** (first-degree) in children, while concerning, are less urgent than deep burns of significant extent. - The depth of injury is a critical factor; superficial burns may be managed with close monitoring if appropriate expertise is available locally. *5% superficial scald in adult* - A **5% TBSA superficial burn** in an adult does not meet the threshold for mandatory burn center referral (typically >10% for partial thickness burns). - **Superficial scalds** can usually be managed with outpatient care, wound dressing, and pain control. - This would only require referral if other complicating factors were present (e.g., involvement of special areas, inhalation injury).

Occupational Dermatoses Indian Medical PG Question 3: In which of the following conditions is phototherapy, specifically ultraviolet light therapy, useful for treatment?

• A. Psoriasis (Correct Answer)
• B. Tinea corporis
• C. Pemphigus
• D. PMLE

Occupational Dermatoses Explanation: ***Psoriasis*** - **Phototherapy** (narrowband UVB, broadband UVB, or PUVA) is a **well-established first-line treatment** for **moderate-to-severe psoriasis**. - It works by **suppressing overactive immune cells** in the skin, reducing inflammation and decreasing keratinocyte proliferation. - **Direct therapeutic effect** on active psoriatic lesions makes this the primary indication for phototherapy in dermatology. *Tinea corporis* - **Tinea corporis** is a **superficial fungal infection** (dermatophytosis) of the skin. - Requires **antifungal medications** (topical azoles or oral terbinafine/griseofulvin) for treatment. - **Phototherapy has no antifungal activity** and is not used for this condition. *Pemphigus* - **Pemphigus** is an **autoimmune blistering disease** with intraepidermal acantholysis. - Treatment requires **systemic immunosuppression** (corticosteroids, rituximab, azathioprine). - **Phototherapy is not indicated** and could potentially worsen the condition. *PMLE* - **Polymorphous light eruption (PMLE)** is a common **photosensitivity disorder**. - While **prophylactic photohardening** (gradual controlled UV exposure) can be used to build tolerance **before sun exposure season**, this is a **preventative desensitization strategy**, not treatment of active disease. - Unlike psoriasis, phototherapy does **not treat active PMLE lesions** and can trigger flares if not done properly. - The primary approach for active PMLE is **sun avoidance, sun protection, and topical corticosteroids**.

Occupational Dermatoses Indian Medical PG Question 4: A child has a rash. His family history is positive for asthma. What could be the most probable diagnosis?

• A. Seborrheic dermatitis
• B. Atopic dermatitis (Correct Answer)
• C. Allergic contact dermatitis
• D. Erysipelas

Occupational Dermatoses Explanation: ***Atopic dermatitis*** - The presence of a rash in a child with a family history of **asthma** strongly suggests atopic dermatitis, as it is part of the **atopic triad** (eczema, asthma, allergic rhinitis). - Atopic dermatitis often presents with **erythematous, pruritic patches** and plaques, commonly affecting flexural areas like the antecubital and popliteal fossae, as well as the face and neck in younger children. *Seborrheic dermatitis* - This condition typically presents with **greasy, yellowish scales** on an erythematous base, often affecting areas rich in sebaceous glands such as the scalp, face (nasolabial folds), and chest. - While it can occur in infants, it does not have the strong association with a family history of asthma seen in atopic dermatitis. *Allergic contact dermatitis* - This rash results from an **exposure to an allergen**, leading to a localized, erythematous, and pruritic eruption, often with vesicles or bullae, at the site of contact. - The history does not provide information about a specific allergen exposure, and while it could produce a similar-looking rash, the family history of asthma points more strongly to atopic diathesis. *Erysipelas* - Erysipelas is a superficial skin infection, usually caused by *Streptococcus pyogenes*, presenting as a **well-demarcated, intensely erythematous, warm, and painful rash** with a raised border. - This is an **acute bacterial infection** and would typically be accompanied by systemic symptoms like fever and chills, which are not mentioned in the child's presentation.

Occupational Dermatoses Indian Medical PG Question 5: Which of the following is not a feature of dermatomyositis?

• A. Salmon Patch (Correct Answer)
• B. Periungual telangiectasias
• C. Gottron's patch
• D. Mechanic's hands

Occupational Dermatoses Explanation: ***Salmon Patch*** - A **salmon patch** (also known as a nevus simplex or stork bite) is a common, benign vascular birthmark that presents as a flat, red or pink patch. - It is **not associated with dermatomyositis** and has no pathogenic link to the condition. *Gottron's patch* - **Gottron's patches** are a classic cutaneous manifestation of dermatomyositis, characterized by erythematous, violaceous, or dusky red papules or plaques over the **extensor surfaces of the metacarpophalangeal and interphalangeal joints**. - Their presence is highly suggestive of dermatomyositis, often preceding or co-occurring with muscle weakness. *Periungual telangiectasias* - **Periungual telangiectasias** are dilated capillaries around the nail folds and are a common skin manifestation of dermatomyositis. - They represent small vessel vasculopathy, a histological feature, and suggest microvascular damage often seen in systemic connective tissue diseases like dermatomyositis. *Mechanic's hands* - **Mechanic's hands** are a cutaneous feature seen in dermatomyositis (and other inflammatory myopathies like antisynthetase syndrome). - They are characterized by **hyperkeratosis**, fissuring, and scaling of the skin, particularly on the lateral and palmar aspects of the fingers, resembling the hands of a manual laborer.

Occupational Dermatoses Indian Medical PG Question 6: Identify the diagnosis based on the dermatology immunofluorescence (IF) image provided.

• A. Pemphigus vulgaris
• B. Pemphigus foliaceus
• C. Bullous pemphigoid
• D. Dermatitis herpetiformis (Correct Answer)

Occupational Dermatoses Explanation: ***Dermatitis herpetiformis*** - The immunofluorescence image shows **granular IgA deposits** at the **dermal papillae region**, which is characteristic of dermatitis herpetiformis. - This condition is strongly associated with **celiac disease** and presents with intensely pruritic papules and vesicles. *Pemphigus vulgaris* - Immunofluorescence in pemphigus vulgaris typically shows a **fishnet pattern** of IgG deposits throughout the **epidermis**, reflecting antibodies against desmoglein 3 and 1. - This pattern is an intercellular deposition, not granular at the dermal papillae. *Pemphigus foliaceus* - Similar to pemphigus vulgaris, pemphigus foliaceus also exhibits **intercellular IgG deposits** in the epidermis, but it is usually more superficial, targeting desmoglein 1. - The image does not show this intercellular epidermal staining. *Bullous pemphigoid* - Bullous pemphigoid is characterized by **linear IgG and C3 deposits along the dermal-epidermal junction** (basement membrane zone). - The image distinctly shows granular IgA, not linear IgG/C3, and specifically in the dermal papillae.

Occupational Dermatoses Indian Medical PG Question 7: A 25-year-old patient presents with chronic itchy, erythematous skin lesions on the flexural areas that have been recurring since childhood. The patient has a family history of asthma. Which of the following is the most important diagnostic criterion for the most likely diagnosis?

• A. Personal or family history of atopy
• B. Elevated serum IgE levels
• C. Early age of onset (before 2 years)
• D. Chronic pruritic eczema with typical morphology and distribution (Correct Answer)

Occupational Dermatoses Explanation: ***Chronic pruritic eczema with typical morphology and distribution*** - The patient presents with **chronic**, **itchy**, **erythematous lesions** on the **flexural areas** (e.g., antecubital and popliteal fossae), characteristic of **atopic dermatitis** (eczema). - The **recurrence since childhood** and the typical distribution represent the **major diagnostic criteria** based on clinical morphology and distribution. - **Clinical presentation with typical morphology** is the **primary diagnostic criterion** according to Hanifin and Rajka criteria. *Elevated serum IgE levels* - While **elevated serum IgE** is often associated with atopic dermatitis, it is a **minor criterion** and a **laboratory finding**, not a primary diagnostic feature. - It reflects an **atopic predisposition**, but **clinical morphology and distribution** remain the most important diagnostic factors. *Personal or family history of atopy* - A **family history of asthma** (an atopic condition) is a **minor criterion** that supports the diagnosis of atopic dermatitis. - However, this is a **predisposing/supporting factor**, not as important as the characteristic clinical morphology and distribution. *Early age of onset (before 2 years)* - While atopic dermatitis often begins in **infancy or early childhood**, this is a **minor criterion** in the diagnostic framework. - The question states symptoms **recurring since childhood** but onset timing is less diagnostically important than the characteristic **clinical presentation** with typical morphology and distribution.

Occupational Dermatoses Indian Medical PG Question 8: Improper handling of mercury in the clinic results in occupational hazard through:

• A. Ingestion of contaminated food items
• B. Contact with mercury-contaminated water
• C. Inhalation of mercury vapors during amalgam preparation
• D. Absorption of mercury through skin

Occupational Dermatoses Explanation: ***Inhalation of mercury vapors during amalgam preparation*** - **Inhalation is the PRIMARY route** of occupational mercury exposure in clinical settings, particularly dental clinics - Elemental mercury **vaporizes readily** at room temperature, and mercury vapor is rapidly absorbed through the lungs (>80% absorption rate) - Improper handling during **amalgam preparation, placement, or removal** releases significant mercury vapors - This is well-documented as the **major occupational hazard** for healthcare workers handling mercury (per NIOSH, OSHA, and WHO guidelines) - Can lead to chronic mercury poisoning with neurological, renal, and respiratory effects *Absorption of mercury through skin* - Intact skin provides an **effective barrier** to elemental mercury absorption - Only **negligible amounts** of elemental mercury are absorbed through intact skin - Skin absorption is primarily relevant for **organic mercury compounds** (like methylmercury), not the elemental mercury used in clinical settings - Even with spills on skin, inhalation of vapors remains the greater hazard *Ingestion of contaminated food items* - This route is associated with **methylmercury exposure** from contaminated fish, not occupational exposure to elemental mercury - **Not a typical occupational hazard** in clinical settings where mercury is handled - Represents environmental/dietary exposure rather than workplace exposure *Contact with mercury-contaminated water* - This is an **environmental concern** related to industrial pollution, not an occupational hazard in clinics - Not a significant route of exposure for healthcare workers handling mercury - Primarily involves methylmercury in aquatic ecosystems rather than elemental mercury in clinical settings

Occupational Dermatoses Indian Medical PG Question 9: Match the following: A) Caplan syndrome- 1) Found first in coal worker B) Asbestosis- 2) Upper lobe predominance C) Mesothelioma- 3) Involves lower lobe D) Sarcoidosis- 4) Pleural effusion is seen

• A. A-3, B-4, C-2, D-1
• B. A-1, B-4, C-3, D-2 (Correct Answer)
• C. A-4, B-2, C-3, D-1
• D. A-2, B-4, C-3, D-1

Occupational Dermatoses Explanation: **A-1, B-4, C-3, D-2** - **Caplan syndrome** was first described in **coal workers** with **rheumatoid arthritis** and progressive massive fibrosis. - **Asbestosis** is often associated with **pleural effusion**, which can be benign or malignant. - **Mesothelioma** typically involves the **lower lobes** of the lungs, specifically the pleura, and is strongly linked to asbestos exposure. - **Sarcoidosis** is characterized by **non-caseating granulomas**, which have a predilection for the **upper lobes** of the lungs. *A-3, B-4, C-2, D-1* - This option incorrectly states that Caplan syndrome involves the lower lobe; **Caplan syndrome** is defined by the presence of large nodules in the lungs of coal workers with rheumatoid arthritis, and their specific lobar distribution is not a defining characteristic. - This option incorrectly states that Mesothelioma has an upper lobe predominance; **Mesothelioma** is a pleural malignancy and typically involves the **lower lobes**, extending along the pleura. *A-4, B-2, C-3, D-1* - This option incorrectly associates Caplan syndrome with pleural effusion; **Caplan syndrome** manifests as rheumatoid nodules in the lungs, not primarily pleural effusion. - This option incorrectly states that Asbestosis has an upper lobe predominance; **Asbestosis** predominantly affects the **lower lobes** of the lungs, causing interstitial fibrosis. *A-2, B-4, C-3, D-1* - This option incorrectly states that Caplan syndrome has an upper lobe predominance; the defining feature of **Caplan syndrome** is the combination of rheumatoid arthritis and pneumoconiosis, not specific lobar involvement. - This option correctly identifies pleural effusion with asbestosis and lower lobe involvement with mesothelioma, but **Caplan syndrome** is not characterized by upper lobe predominance.

Occupational Dermatoses Indian Medical PG Question 10: Most common precipitant of contact dermatitis is?

• A. Gold
• B. Silver
• C. Iron
• D. Nickel (Correct Answer)

Occupational Dermatoses Explanation: ***Nickel*** - **Nickel** is the most frequent cause of **allergic contact dermatitis**, commonly found in jewelry, belt buckles, and zippers. - Exposure leads to a **Type IV hypersensitivity reaction**, characterized by erythema, itching, and vesiculation. *Gold* - While gold can cause contact dermatitis, it is **far less common** than nickel allergy. - Reactions to gold are often seen with prolonged skin contact, such as with jewelry. *Silver* - **Silver** is a **rare cause** of allergic contact dermatitis. - Allergic reactions to silver are typically observed in individuals with extensive exposure, such as jewelers. *Iron* - **Iron** is **not a common precipitant** of contact dermatitis. - Allergic reactions to iron are exceedingly rare, as iron is an essential element found naturally in the body.

Occupational Dermatoses Flashcard 1 of 1

Question: Dermatitis and burning of hands and fingers common among the pickle industry workers, who use their hands for handling chilly powder is also known as _____

Answer: hunan hand