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Question 1
Incorrect
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A 55-year-old diabetic female patient comes in with bilateral erythematous lesions on her shins that have been present for four months. The lesions are surrounded by telangiectasia. What is the probable diagnosis?
Your Answer: Granuloma annulare
Correct Answer: Necrobiosis lipoidica
Explanation:There is no association between erythema nodosum and telangiectasia in the surrounding area.
Skin Disorders Linked to Diabetes
Diabetes mellitus is a chronic metabolic disorder that affects various organs in the body, including the skin. Several skin disorders are associated with diabetes, including necrobiosis lipoidica, infections such as candidiasis and staphylococcal, neuropathic ulcers, vitiligo, lipoatrophy, and granuloma annulare. Necrobiosis lipoidica is characterized by shiny, painless areas of yellow, red, or brown skin, typically on the shin, and is often associated with surrounding telangiectasia. Infections such as candidiasis and staphylococcal can also occur in individuals with diabetes. Neuropathic ulcers are a common complication of diabetes, and vitiligo and lipoatrophy are also associated with the condition. Granuloma annulare is a papular lesion that is often slightly hyperpigmented and depressed centrally, but recent studies have not confirmed a significant association between diabetes mellitus and this skin disorder. It is important for individuals with diabetes to be aware of these potential skin complications and to seek medical attention if they notice any changes in their skin.
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This question is part of the following fields:
- Dermatology
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Question 2
Correct
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A 38-year-old man presents with pruritic, violaceous papules in a polygonal pattern on the flexor surface of his forearms. Several of these papules have merged to form plaques. What is the probable diagnosis?
Your Answer: Lichen planus
Explanation:Lichen planus is a rash that appears as purple, itchy, polygonal papules on the flexor surfaces of the body. It is often accompanied by Wickham’s striae on the surface and can also affect the mouth. In contrast, lichen sclerosus is characterized by white, itchy spots that commonly appear on the vulva of older women.
Understanding Lichen Planus
Lichen planus is a skin condition that is believed to be caused by an immune response, although the exact cause is unknown. It is characterized by an itchy, papular rash that typically appears on the palms, soles, genitalia, and flexor surfaces of the arms. The rash often has a polygonal shape and a distinctive white-lines pattern on the surface, known as Wickham’s striae. In some cases, new skin lesions may appear at the site of trauma, a phenomenon known as the Koebner phenomenon.
Oral involvement is common in around 50% of patients, with a white-lace pattern often appearing on the buccal mucosa. Nail changes may also occur, including thinning of the nail plate and longitudinal ridging. Lichenoid drug eruptions can be caused by certain medications, such as gold, quinine, and thiazides.
The main treatment for lichen planus is potent topical steroids. For oral lichen planus, benzydamine mouthwash or spray is recommended. In more extensive cases, oral steroids or immunosuppression may be necessary.
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This question is part of the following fields:
- Dermatology
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Question 3
Correct
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A 21-year-old woman presents with a two day history of increasing dysuria. During examination, inflamed blisters are observed on the outer labia.
What is the most suitable treatment option?Your Answer: Aciclovir
Explanation:Understanding Genital Herpes and Treatment Options
Genital herpes is a sexually transmitted infection caused by the herpes simplex viruses (HSV-1 or HSV-2). It presents as clusters of papules and vesicles on the outer genitals in both men and women, usually appearing 4-7 days after sexual exposure to HSV for the first time. Unfortunately, there is no cure for genital herpes, but treatment with aciclovir can reduce the duration of symptoms. Other treatment options include antibiotics like azithromycin and clindamycin for bacterial infections, antifungal agents like fluconazole for fungal infections, and metronidazole for anaerobic bacteria and protozoa. It is important to seek medical attention and start treatment as soon as possible to manage symptoms and prevent transmission to others.
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This question is part of the following fields:
- Dermatology
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Question 4
Incorrect
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A toddler is brought to your clinic as the mother has noticed some skin lesions on the child's face. Upon examination, you observe multiple small white papules on the nose. What is the probable diagnosis?
Your Answer: Molluscum contagiosum
Correct Answer: Milia
Explanation:Milia, which are often found on the face of newborns, are a normal occurrence and can be seen in up to 50% of babies. They typically disappear on their own within a few weeks.
Understanding Milia: Small, Benign Cysts on the Face
Milia are small cysts that are filled with keratin and are typically found on the face. These cysts are benign and are not harmful to one’s health. Although they can appear at any age, they are more commonly found in newborns. Milia are often described as small, white bumps that are painless and do not cause any discomfort.
While the exact cause of milia is unknown, they are thought to occur when dead skin cells become trapped in the skin’s surface. They can also develop as a result of using heavy skin care products or as a side effect of certain medications. In most cases, milia will disappear on their own without any treatment. However, if they persist or become bothersome, a dermatologist may recommend treatment options such as extraction or chemical peels.
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This question is part of the following fields:
- Dermatology
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Question 5
Incorrect
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A 56-year-old man with a history of type 2 diabetes mellitus and benign prostatic hyperplasia presents to dermatology with multiple lesions on his shin. Upon examination, symmetrical, tender, erythematous nodules are observed. The lesions are healing without scarring. What is the probable diagnosis?
Your Answer: Necrobiosis lipoidica diabeticorum
Correct Answer: Erythema nodosum
Explanation:The relevant diagnosis for this question relies solely on the description of the lesions, as the patient’s medical history is not a factor. Specifically, the tender shin lesions are indicative of erythema nodosum.
Understanding Shin Lesions: Differential Diagnosis and Characteristic Features
Shin lesions can be caused by a variety of conditions, and it is important to differentiate between them in order to provide appropriate treatment. The four most common conditions that can cause shin lesions are erythema nodosum, pretibial myxoedema, pyoderma gangrenosum, and necrobiosis lipoidica diabeticorum.
Erythema nodosum is characterized by symmetrical, tender, erythematous nodules that heal without scarring. It is often caused by streptococcal infections, sarcoidosis, inflammatory bowel disease, or certain medications such as penicillins, sulphonamides, or oral contraceptive pills.
Pretibial myxoedema, on the other hand, is seen in Graves’ disease and is characterized by symmetrical, erythematous lesions that give the skin a shiny, orange peel appearance.
Pyoderma gangrenosum initially presents as a small red papule, which later develops into deep, red, necrotic ulcers with a violaceous border. It is idiopathic in 50% of cases, but may also be seen in inflammatory bowel disease, connective tissue disorders, and myeloproliferative disorders.
Finally, necrobiosis lipoidica diabeticorum is characterized by shiny, painless areas of yellow/red skin typically found on the shin of diabetics. It is often associated with telangiectasia.
In summary, understanding the differential diagnosis and characteristic features of shin lesions can help healthcare professionals provide appropriate treatment and improve patient outcomes.
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This question is part of the following fields:
- Dermatology
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Question 6
Incorrect
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A 32-year-old male patient comes in for mole removal. Which areas of the body are more prone to developing keloid scars?
Your Answer: Flexor surfaces of limbs
Correct Answer: Sternum
Explanation:Understanding Keloid Scars
Keloid scars are abnormal growths that develop from the connective tissue of a scar and extend beyond the boundaries of the original wound. They are more common in people with dark skin and tend to occur in young adults. Keloids are most frequently found on the sternum, shoulder, neck, face, extensor surface of limbs, and trunk.
To prevent keloid scars, incisions should be made along relaxed skin tension lines. However, if keloids do develop, early treatment with intra-lesional steroids such as triamcinolone may be effective. In some cases, excision may be necessary, but this should be approached with caution as it can potentially lead to further keloid scarring.
It is important to note that the historical use of Langer lines to determine optimal incision lines has been shown to produce worse cosmetic results than following skin tension lines. Understanding the predisposing factors and treatment options for keloid scars can help individuals make informed decisions about their care.
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This question is part of the following fields:
- Dermatology
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Question 7
Correct
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A 16-year-old boy presents to you with complaints of excessive sweating in his hands. He reports feeling embarrassed in social situations, particularly when he has to shake hands with someone. He is also concerned about how this may impact his upcoming A-level exams.
Which of the following is the most appropriate initial management approach for this condition?Your Answer: Aluminium chloride
Explanation:Hyperhidrosis is not treated with beta blockers like propranolol or calcium channel blockers like nifedipine.
Hyperhidrosis is a condition characterized by the excessive production of sweat. To manage this condition, there are several options available. The first-line treatment is the use of topical aluminium chloride preparations, although it may cause skin irritation as a side effect. Iontophoresis is another option that is particularly useful for patients with palmar, plantar, and axillary hyperhidrosis. Botulinum toxin is also licensed for axillary symptoms. Surgery, such as Endoscopic transthoracic sympathectomy, is another option, but patients should be informed of the risk of compensatory sweating. Overall, there are various management options available for hyperhidrosis, and patients should discuss with their healthcare provider to determine the best course of action.
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This question is part of the following fields:
- Dermatology
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Question 8
Correct
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A 56-year-old Caucasian man presents with a rash on the face. He first noticed this six months ago when he experienced episodes of flushing on the face. This has often occurred after he had alcohol or in situations where he felt stressful. A month ago, he started noticing a rash on his cheeks which came on intermittently until three weeks ago when the rash has become permanent. There has been no pain or itch associated with the rash. He is otherwise fit and well. He does not smoke.
On examination of the face, there is marked erythema with papules, pustules and telangiectasia. There are no comedones seen. The rash is distributed across the cheeks and nose. There is no per-oral or peri-orbital involvement.
What is the most likely diagnosis?Your Answer: Acne rosacea
Explanation:The features described suggest acne rosacea, with episodic flushing, papules and pustules with telangiectasia on the nose, cheeks and forehead. Other conditions such as acne vulgaris, systemic lupus erythematosus, seborrhoeic dermatitis and shingles are unlikely based on the described symptoms.
Understanding Rosacea: Symptoms and Management
Rosacea, also known as acne rosacea, is a chronic skin condition that has no known cause. It typically affects the nose, cheeks, and forehead, and the first symptom is often flushing. Over time, telangiectasia (visible blood vessels) may appear, followed by persistent redness with papules and pustules. In some cases, rhinophyma (enlarged nose) may develop, and there may be ocular involvement, such as blepharitis. Sunlight can exacerbate symptoms.
Mild cases of rosacea may be treated with topical metronidazole, while topical brimonidine gel may be used for patients with predominant flushing but limited telangiectasia. More severe cases may require systemic antibiotics like oxytetracycline. Patients are advised to apply high-factor sunscreen daily and use camouflage creams to conceal redness. Laser therapy may be appropriate for those with prominent telangiectasia, and patients with rhinophyma should be referred to a dermatologist.
Overall, understanding the symptoms and management of rosacea can help individuals manage their condition and improve their quality of life.
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This question is part of the following fields:
- Dermatology
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Question 9
Correct
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A 32-year-old patient with a history of psoriasis complains of redness in the groin and genital region, as well as in the axilla. The patient has previously mentioned a distaste for creams that are messy or difficult to use. What is the best course of treatment?
Your Answer: Topical steroid
Explanation:Topical steroids are effective in treating flexural psoriasis in this patient.
NICE recommends a step-wise approach for chronic plaque psoriasis, starting with regular emollients and then using a potent corticosteroid and vitamin D analogue separately, followed by a vitamin D analogue twice daily, and then a potent corticosteroid or coal tar preparation if there is no improvement. Phototherapy, systemic therapy, and topical treatments are also options for management. Topical steroids should be used cautiously and vitamin D analogues may be used long-term. Dithranol and coal tar have adverse effects but can be effective.
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This question is part of the following fields:
- Dermatology
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Question 10
Incorrect
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You are examining a 7-month-old infant who has a capillary haemangioma located on the right cheek that is beginning to interfere with their vision. Following a conversation with the parents, you have decided to initiate treatment for this area due to the potential impact on eyesight.
What is the primary treatment option for capillary haemangioma?Your Answer: Surgical removal
Correct Answer: Propranolol
Explanation:When it comes to capillary haemangiomas that require intervention, the preferred treatment is propranolol. Other options include laser therapy or systemic steroids, but topical steroids are unlikely to be effective. Surgery is generally not recommended for most cases.
Understanding Strawberry Naevus
Strawberry naevus, also known as capillary haemangioma, is a type of skin condition that usually develops in infants within the first month of life. It is characterized by raised, erythematous, and multilobed tumours that commonly appear on the face, scalp, and back. While it is not present at birth, it can grow rapidly and reach its peak size at around 6-9 months before regressing over the next few years. In fact, around 95% of cases resolve before the child reaches 10 years of age. However, there are potential complications that may arise, such as obstructing visual fields or airway, bleeding, ulceration, and thrombocytopaenia.
Capillary haemangiomas are more common in white infants, particularly in female and premature infants, as well as those whose mothers have undergone chorionic villous sampling. In cases where treatment is necessary, propranolol is now the preferred choice over systemic steroids. Topical beta-blockers like timolol may also be used. It is important to note that there is a deeper type of capillary haemangioma called cavernous haemangioma. Understanding the nature of strawberry naevus is crucial in managing its potential complications and providing appropriate treatment.
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This question is part of the following fields:
- Dermatology
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