The annular or circinate form of sarcoidosis of the skin described above is a striking clinical expression of the disease. The lesions occur particularly on the forehead, face, and nape of the neck.

The lesions of tinea corporis are annular or circular (hence, the term "ringworm") in shape, and usually well-demarcated and discrete. However, the lesions may converge into a confluent plaque ...

The signalment (young pig, white breed) and location (medial thighs, abdomen) and classical appearance (coalescing annular to serpiginous raised, crusty, non-pruritic) of the lesions, combined ...