Ringworm is most common in horses in Australia in periods of high relative humidity between November and April (summer). Clinical signs generally appear between 5-10 days following contact, and the hair within lesions becomes erect, and lesions become visible from a distance. The hair is easily plucked from the horse, occasionally in tufts where the hair is matted at the base by exudate to leave a grey, moist, glistening lesion. Single lesions may spread to about 35mm diameter. Hair regrowth generally starts about 30 days after infection. Itching is uncommon in horses.