In the treatment of tinea capitis, or ringworm of the scalp, caused by the microspora, the criteria generally accepted for clinical cure are loss of fluorescence, absence of organisms in smears or hairs, negative culture, and disappearance of clinical or gross evidence of a lesion for a period of at least two months following the discontinuance of all treatment. The patient is usually observed at weekly or biweekly intervals. As long as fluorescence is present, there is no absolute need for either a microscopic examination or a culture. With the disappearance of fluorescence, however, smears and cultures of the lesion become imperative.
Thick greases or ointments may easily mask fluorescence. In the routine examination of a patient's scalp, it should be impressed on the child's parents that the medicament must be washed out thoroughly before such an examination. Felsher,1 for example, has found that 10 or 20% potassium iodide
MOORE M. MASKING OF FLUORESCENCE BY TETRACHLOROPARABENZOQUINONE (``SPERGON''). AMA Arch Derm Syphilol. 1952;66(5):621–623. doi:10.1001/archderm.1952.01530300077010
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