Pest or disease

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Does anyone keep if this is a pest or disease on my hardy garden hibiscus?
046DF91B-A07F-4368-9B18-6D8840624AF1.jpeg
 
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Not a fungal problem that I readily recognise. Mallows are usually trouble-free in this respect. I am wondering if the leaf of your hibiscus has been adopted as a nursery for some spider or other visitor. If in doubt, remove the affected leaf and keep if for a while, say, in a glass jar and observe. Otherwise, remove and burn.
 
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This is a rust fungus, most likely Hollyhock Rust (Puccinia malvacearum) which affects many members of the Mallow Family (Malvaceae) including Hibiscus.
 

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