Medication Summary
Assessment of treatments for Kyrle disease is a difficult task since controlled therapeutic studies are not available for this uncommon disorder. Treatments that have been used unsuccessfully in the past include keratolytics, 5-fluorouracil, topical corticosteroids, methotrexate, mercury, chloroquine, and prednisone. A case showed a response to clindamycin therapy.[7] Some improvement has been reported with vitamin A at a dose of 100,000 IU/d, with or without vitamin E at 400 IU/d. This combination has produced improvement after 1 month of therapy. Topical retinoic acid 0.1% cream also can produce improvement, and changes in lesions have been observed as rapidly as within 6-7 days.
Another approach is administration of oral retinoids. In one study, isotretinoin given at a dose of 40 mg bid (1 mg/kg/d) resulted in decreased pruritus, desiccation, and slough of lesions within 4 weeks, with resurfacing of skin approaching normal within 5 weeks. This drug then was decreased to 40 mg/80 mg on alternate days (0.75 mg/kg/d) for 8 more weeks and discontinued, for a total treatment course of 13 weeks.[11] Etretinate in high doses also is effective, but relapse has been reported following discontinuation of therapy.
Vitamins
Class Summary
Essential for normal DNA synthesis.
Vitamin A (Aquasol A, Palmitate-A)
May improve abnormal keratinization.
Retinoids
Class Summary
Can influence and alter abnormal keratinization.
Tretinoin topical (Avita, Retin-A)
Inhibits microcomedo formation and eliminates lesions present. Makes keratinocytes in sebaceous follicles less adherent and easier to remove. Available as 0.025, 0.05, and 0.1% creams. Available also as 0.01 and 0.025% gels.
Isotretinoin (Accutane)
Oral agent that treats serious dermatologic conditions. Synthetic 13-cis isomer of the naturally occurring tretinoin (trans -retinoic acid). Both agents are structurally related to vitamin A. Decreases sebaceous gland size and sebum production. May inhibit sebaceous gland differentiation and abnormal keratinization.
Dose used is standard antiacne dose recommended also for treatment of Kyrle disease in one study; doses and duration of therapy have not been subjected to controlled study, but one study recommended a total duration of 13 wk, with a reduction of the dose in mid course.
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