Ringworm, medically known as tinea, is a common fungal infection affecting the skin, hair, or nails. Despite its misleading name, it is caused by a type of fungus, not a worm. This highly contagious infection can appear on various parts of the body, including the arms. Early identification relies on understanding its typical appearance on the arm.
Visual Characteristics on the Arm
Ringworm on the arm, specifically called tinea corporis, has distinct visual characteristics. It typically starts as a small, discolored patch or bump that gradually expands outwards. The rash commonly forms a circular or oval shape, giving it the characteristic “ring” appearance. The border of the rash is usually raised, red, and scaly, sometimes bumpy or inflamed. The border might also have small papules or fluid-filled blisters.
The center of the ringworm rash often looks clearer, flatter, or less inflamed than its raised border. However, the center can also appear scaly or discolored. The color of the rash varies depending on skin tone; on lighter skin, it typically appears red or pink. On darker skin tones, ringworm may look brownish, grayish, or purplish, sometimes with less pronounced redness, and the raised border can be darker than the inner patch. The affected area’s texture can be scaly, flaky, or dry within the ring or along its border.
The size of ringworm lesions on the arm varies, ranging from small, coin-sized patches to larger, expanding lesions. As the infection progresses, the rings can expand, and multiple lesions may develop and even merge, creating a polycyclic pattern. It can appear anywhere on the arm, from the shoulder down to the wrist.
Other Common Signs
Ringworm on the arm also causes specific sensations. The rash is often intensely itchy, a common indicator of the infection. This itching, medically known as pruritus, can range from mild to severe.
Some individuals also experience a burning or stinging sensation with the rash. This discomfort adds to the irritation. The affected skin area might also feel tender to the touch.
When to Seek Medical Advice
If you suspect ringworm on your arm, consulting a doctor or dermatologist is advisable for accurate diagnosis. Proper diagnosis is important because various other skin conditions, such as eczema or psoriasis, can mimic the appearance of ringworm, and misdiagnosis can lead to incorrect or delayed treatment. Using inappropriate treatments, such as corticosteroid creams, can even worsen the fungal infection.
You should seek medical advice if the rash is spreading, becomes severely itchy or painful, or if uncertain about the condition. Consult a doctor if the rash does not improve after two weeks of over-the-counter antifungal treatments. A doctor can determine the best course of action and prescribe stronger antifungal medications if needed.