The correct answer is option 4 - fungal. Ringworm is a fungal infection that affects the skin, scalp, and nails. Despite its name, ringworm is not caused by a worm, but by a group of fungi called dermatophytes. These fungi thrive in warm, moist environments and can be found in soil, on animals, and on humans. When the fungi come into contact with the skin, they can cause a red, circular rash that may be itchy and scaly. Ringworm can be spread through direct contact with an infected person or animal, or by touching contaminated objects such as clothing or towels. Treatment for ringworm usually involves antifungal medications, both topical and oral, to eliminate the infection.