Final answer:
An annular lesion is a skin abnormality appearing as a circular, ring-like rash, often seen in conditions like ringworm. Distinguished by a clear center and raised red edge, these lesions are diagnosed visually or with tests like Wood's lamp examination. Treatment typically involves antifungal medications.
Step-by-step explanation:
An annular lesion is a term used to describe a skin condition that appears as a circular or ring-like rash. It is characterized by a clear center and a red, raised, or bumpy perimeter. This can often be seen in conditions such as ringworm, also known as tinea corporis, which is a fungal infection of the skin.
The name 'ringworm' is actually misleading because no actual worm is involved; the infection gets its name from the ring-like pattern that typically forms on the skin. These lesions can cause itching and discomfort, and they often grow radially while healing towards the center, creating a distinctive ring appearance. Ringworm is one example of an annular lesion and is diagnosed through clinical examination or tests such as the use of a Wood's lamp which causes fluorescence under ultraviolet light.
It is important to differentiate annular lesions from other skin conditions, such as contact dermatitis or more serious concerns like skin cancers that may require different treatments. Treatment for annular lesions like ringworm usually involves antifungal medications. Proper identification and treatment are crucial for healing and preventing the spread of the infection.