Dermatology

Question 1

What causes pityriasis versicolor?

Answer 1

fungal infection. Genus malassezia

Question 2

What is the treatment for pityriasis versicolor?

Answer 2

econazole 1% to wet skin, leave overnight, for 3 nights
OR ketoconazole 2% shampoo once daily for 5 mins then wash off, for 5 days
OR miconazole 2% shampoo topically, once daily for 10mins and wash off, for 10 days

Question 3

Treatment for pityriasis versicolor that is not responding to topical treatment?

Answer 3

oral fluconazole 400mg as single dose

Question 4

Treatment for pityriasis rosea

Answer 4

Usually self-limiting

severe itch is not common, can use topical steroid for itch betamethasone 0.02%cream topically once or twice daily

Question 5

Treatment for shingles

Answer 5

Valaciclovir 1g tds for 7 days

within 72 hours of onset

Question 6

Treatment for herpes

Answer 6

Oral: valaciclovir 1g bd
Genital: valaciclovir 500mg bd for 10 days
within 72 hours of onset for first presentation

Question 7

Psoriasis treatment - trunk and limbs

Answer 7

coal tar 1% emulsion or gel od or bd for 1 month
IF NOT RESPONDING:
Add methylprednisolone 0.1% od until clear (2-6 wks)

Question 8

Treatment for seborrhoeic dermatitis (face, flexural and scrotal)

Answer 8

hydrocortisone 1% + clotrimazole 1% od or bd until skin clear (up to 2 weeks)
If no improvement:
methylprednisolone 0.1% od and clotrimazole 1% bd

Question 9

Psoriasis treatment - flexural inc. groin

Answer 9

methylprednisolone 0.1% od until clear (2-6 wks)

Question 10

Causes of erythema nodosum (5 categories)

Answer 10

unknown trigger
Infections (chlamydia, strep or viral urti, HSV, HIV)
Drugs (OCP, NSAIDS, amoxicillin)
Inflammatory disease (IBD, sarcoidosis, malignancy)
Pregnancy