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Skin infections

Viral skin infections key points test

Choose the virus that causes each dermatological eruption: Wart *! Human papillomavirus * Pox virus * Herpes simplex * Herpes zoster Explanation: Warts are due to infection with a variety of types of human papillomavirus. Molluscum contagiosum * Human papillomavirus *! Pox virus * Herpes simplex * Herpes zoster Explanation: Molluscum contagiosum is due to infection with molluscum contagiosum pox virus, the largest virus known. Cold sore * Human papillomavirus * Pox virus *! Herpes simplex * Herpes zoster Explanation: Cold sores are the secondary eruption of Herpes simplex. Shingles * Human papillomavirus * Pox virus * Herpes simplex *! Herpes zoster Explanation: Shingles is the secondary eruption of Herpes zoster. Choose the best description for each skin condition: Wart *! Hyperkeratotic papule * Umbilicated papule * Umbilicated vesicles * Dermatomal umbilicated vesicles Explanation: Characteristically, warts present as hyperkeratotic papules. Molluscum contagiosum * Hyperkeratotic papule *! Umbilicated papule * Umbilicated vesicles * Dermatomal umbilicated vesicles Explanation: Characteristically, molluscum contagiosum presents as umbilicated papules. A soft white core can be expressed from the central umbilication. Cold sores * Hyperkeratotic papule * Umbilicated papule *! Umbilicated vesicles * Dermatomal umbilicated vesicles Explanation: Characteristically, cold sores present as umbilicated vesicles, although the umbilication is not always obvious and late lesions are crusted erosions. Shingles * Hyperkeratotic papule * Umbilicated papule * Umbilicated vesicles *! Dermatomal umbilicated vesicles Explanation: Characteristically, shingles presents as umbilicated vesicles in a unilateral dermatomal distribution. There may be painful erythematous plaques instead or as well. Which of the following statements are true about a viral wart? * The most common site is a mucosal surface * It often provokes localised eczema *! It may induce mucocutaneous malignancy * It may be accompanied by persistent dermatomal pain Explanation: Viral warts may induce malignancy, particularly genital warts oncogenic types 16 and 18, which cause cervical, vulvar and penile cancer. Which of the following statements are true about molluscum contagiosum? * The most common site is a mucosal surface *! It often provokes localised eczema * It may induce mucocutaneous malignancy * It may be accompanied by persistent dermatomal pain Explanation: Molluscum contagiosum may present as localised eczema in warm moist flexural areas; the viral papule(s) are sometimes unnoticed. Which of the following statements are true about herpes simplex? *! The most common site is a mucosal surface * It often provokes localised eczema * It may induce mucocutaneous malignancy * It may be accompanied by persistent dermatomal pain Explanation: Herpes simplex frequently affects oral and genital mucosae, but it can also affect cutaneous areas. Which of the following statements are true about herpes zoster? * The most common site is a mucosal surface * It often provokes localised eczema * It may induce mucocutaneous malignancy *! It may be accompanied by persistent dermatomal pain Explanation: Secondary herpes zoster infection is characteristically painful, and may result in disabling postherpetic neuralgia for weeks or months after the skin eruption has resolved.