Hi Kay, I think you have joined by posting in the discussion. Scroll to the top of the discussion and click the 3 dots in the lower right corner under the discussion description. If you see the option to Mute this discussion, you are subscribed to the discussion and will receive an email notification when someone makes a post here.

Since this is a discussion from 2016, you may also be interested the following newer discussions:
-- (2020) Erythema Nodosum: https://connect.mayoclinic.org/discussion/erythema-nodosum/