Red, itchy patches that increase in size and peel, especially when they come back after treatment, usually mean the fungal infection was not completely cured or has spread to nearby areas. Since you have it on multiple sites, like the knee, thigh, and ankle, it suggests the infection may be spreading through contact or clothing. The key is to use an effective antifungal cream like terbinafine or luliconazole regularly for a full course and continue for some time even after the skin looks normal, as stopping early often leads to recurrence. Also, wash and dry affected areas well, avoid reusing unwashed clothes, and do not use steroid creams, as they can suppress symptoms but worsen the infection. Because your problem has returned, it is best to consult a doctor who may prescribe stronger oral treatment to clear it completely.