Ringworm is a contagious affection of the skin due to the presence of a vegetable parasite, a fungi, and forming ring-shaped or circular, itching and discolored patches covered with vesicles or powdery scales. It occurs either on the body, the face, or the scalp. Different varieties are distinguished as Tinea circinata, Tinea tonsurans, etc., but all are caused by the same parasite (a species of Trichophyton), usually in the humid weather and, or locations.
Although prescribing based on single and, or local symptoms is against the philosophy of homeopathy, but I have observed wonders the Bacillinium did in almost all the cases of ringworm; hence this prescription:
Becillinum 200 or 1M dilution, preferably German
2-4 drops stirred in 2 tbsps fresh water
2 doses/day, morning 6-7am, evening 5-6pm
repeat weekly, only if required
Avoid eating, drinking and, or smoking before and, or after taking any of the Homeopathic, Biochemic, Tautopathic and, or Bauch’s Flower remedies, at least for half an hour as a precaution. IMHO, almost all medicines give more effective results when taken as per timings given above and only a few may have specific characteristics at other times.
I hope, only first 2 doses of this will cure and, or annihilate your ringworm in its whole extent within a week, and that’s forever! In addition to above you might want to try a few doses of some specific remedies for a complete eradication of this disease 
