i-Human Week 4 Case study: 13-
year-Old Female WitH itCHy
skin 100 exam QuestiOns and
1
ansWers WitH ratiOnales
100%COrreCt QuestiOns and
ansWers lattest 2025-2026
already Graded a+
Guaranteed Pass
,2
, SECTION 1: HISTORY OF PRESENT ILLNESS (HPI) – 20 Questions
1. What is the most important initial question to ask about the onset of itching?
• Answer: "When did the itching first start?"
• Rationale: Determining onset helps distinguish acute from chronic conditions. This case
typically presents with gradual onset over 1-3 weeks, suggesting chronic dermatologic
conditions rather than acute allergic reactions.
3 2. What is the key characteristic of itching that helps differentiate scabies from atopic
dermatitis?
• Answer: Whether itching is worse at night
• Rationale: Nocturnal pruritus is a hallmark of scabies infestation (Sarcoptes scabiei mite
activity increases at night) and is a critical differentiating factor. Atopic dermatitis can
also worsen at night but is not as pathognomonic.
3. What exposure history question is most critical for ruling out scabies?
• Answer: "Has anyone else in your household or close contacts been itching?"
• Rationale: Scabies is highly contagious and spreads through close skin-to-skin contact.
Household contacts developing similar symptoms strongly suggests scabies rather than
atopic dermatitis.
4. Why is it important to ask about new soaps, detergents, or lotions?
• Answer: To identify potential allergic contact dermatitis triggers
• Rationale: New topical products can cause allergic contact dermatitis. In this case,
patients typically deny new product exposure, supporting atopic dermatitis over contact
dermatitis.
5. What is the classic distribution of lesions in atopic dermatitis?
• Answer: Flexural areas – antecubital (inner elbows) and popliteal (behind knees) fossae,
neck, and wrists
• Rationale: In older children and adolescents, atopic dermatitis characteristically involves
flexural surfaces. This distribution differs from infantile atopic dermatitis, which affects
the face and extensor surfaces.
6. What is the significance of asking about personal history of asthma or allergies?
year-Old Female WitH itCHy
skin 100 exam QuestiOns and
1
ansWers WitH ratiOnales
100%COrreCt QuestiOns and
ansWers lattest 2025-2026
already Graded a+
Guaranteed Pass
,2
, SECTION 1: HISTORY OF PRESENT ILLNESS (HPI) – 20 Questions
1. What is the most important initial question to ask about the onset of itching?
• Answer: "When did the itching first start?"
• Rationale: Determining onset helps distinguish acute from chronic conditions. This case
typically presents with gradual onset over 1-3 weeks, suggesting chronic dermatologic
conditions rather than acute allergic reactions.
3 2. What is the key characteristic of itching that helps differentiate scabies from atopic
dermatitis?
• Answer: Whether itching is worse at night
• Rationale: Nocturnal pruritus is a hallmark of scabies infestation (Sarcoptes scabiei mite
activity increases at night) and is a critical differentiating factor. Atopic dermatitis can
also worsen at night but is not as pathognomonic.
3. What exposure history question is most critical for ruling out scabies?
• Answer: "Has anyone else in your household or close contacts been itching?"
• Rationale: Scabies is highly contagious and spreads through close skin-to-skin contact.
Household contacts developing similar symptoms strongly suggests scabies rather than
atopic dermatitis.
4. Why is it important to ask about new soaps, detergents, or lotions?
• Answer: To identify potential allergic contact dermatitis triggers
• Rationale: New topical products can cause allergic contact dermatitis. In this case,
patients typically deny new product exposure, supporting atopic dermatitis over contact
dermatitis.
5. What is the classic distribution of lesions in atopic dermatitis?
• Answer: Flexural areas – antecubital (inner elbows) and popliteal (behind knees) fossae,
neck, and wrists
• Rationale: In older children and adolescents, atopic dermatitis characteristically involves
flexural surfaces. This distribution differs from infantile atopic dermatitis, which affects
the face and extensor surfaces.
6. What is the significance of asking about personal history of asthma or allergies?
