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Tinea Capitis is a very common type of skin disorder. Tinea Capitis or "ring worm of the scalp" refers to an itchy, scaly rash of the scalp.
Tinea Capitis is caused due to fungal infection and can easily transmit from person-to-person throughcombs, brushes, couches, and sheets for long periods.
Since your accidental exposure was just once it may not be suficient to infect the scalp especially since you are already on treatment for it.
You could start using the medication on your scalp tp treat it to avoid any erruption on the scalp.
In general ringworm responds well to topical treatment. Topical antifungals are applied to the lesion twice a day for at least 3 weeks. The lesion usually resolves within 2 weeks, but therapy should be continued for another week to ensure the fungus is completely eradicated. The most commonly used antifungal creams are Clotrimazole, Ketoconazole, Miconazole, Terbinafine and Tolnaftate.
If there are several ringworm lesions or if the lesions are extensive, oral antifungal medications can be used. Oral medications are taken once a day for 7 days and result in higher clinical cure rates. The antifungal medications most commonly used are Itraconazole and Terbinafine.
Ketaconazole is available as a shampoo which can be used immediately and fcontinued or a few weeks more as a preventive measure.
ref:http://en.wikipedia.org/wiki/Tinea_capitis