Garden Pests and Diseases: what is this on my swiss chard, 0 by alicemagooey

alicemagooey wrote:
I have never uploaded a photo direct from my computer before.. not sure if it will work.
i usually use flickr..

will come back and edit with a flicker pic if no photo shows up here, as i realise a photo of the problem is really helpful.

i browsed the other posts and could not find the response.

my question: what is this on these swiss chard leaves..They are raised bumps..
they are blackish brown and found on the stems and actually embedded into the leaves themselves(the green part)..They are like a scale in that they can peel off with your fingernail..
is there a bug egg inside..and what causes this

thank you
alice