Ringworm is a fungal infection that can cause hair loss. Ringworm on the scalp, or tinea capitis, can cause temporary bald areas on the head.
Symptoms include:
a small spot that gets bigger, causing scaly, bald patches of skin brittle hair that breaks easily itchy, red patches of skin in the affected areas oozing blisters on the scalp ring-like patches, with a red outside and the inside of the circle matching the skin tone
If ringworm does not heal by itself, then a doctor may prescribe an antifungal medicine. Alternatively, they may prescribe an antibiotic, such as Griseofulvin.