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The physical condition presented nothing of note, except for a certain sluggishness of the skin with marked comedones.

On the upper trunk so-called double and multiple comedo have been noted—the two, three, or even four closely-contiguous blackheads are, beneath the surface, intercommunicable, the dividing duct-walls having apparently disappeared by fusion.

How would you treat a case of comedo?

Interspersed may generally be seen blackheads, or comedones.

Is there any difficulty in the diagnosis of comedo?