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Skin testing with 1:1000 cobalt chloride will yield a delayed tuberculin reaction in an individual without atopy

Drug intake, sudden and uncommon age of onset, pruritus, a monomorphic pattern and an involvement of extra-seborrheic areas are features that distinguish acneiform eruptions from acne vulgaris

Association of vitamin B12 deficiency in people with type 2 diabetes on metformin and diabetic peripheral neuropathy Nature article: Shows prolonged metformin use correlates with lower B12 and more severe diabetic neuropathy
