Chronic tinea caused by Trichophyton concentricum. It is present in tropical regions. The annular lesions have scales at their periphery.
A type of ringworm common in tropical regions is characterized by patches or concentric scaly rings on the skin. These rings expand outward, creating a pattern reminiscent of watered silk. The scales are akin to thin flakes, similar to tissue paper, that are firmly attached at the edges of the ring but loose at the center. This condition is also known as gogo, scaly ringworm, Tokelau ringworm, or tropical tinea circinata.