I managed to get in to see a dermatologist really fast. If you tell them you have a very painful nodule on your skin, they think it's shingles and will see you right away! Well I did not have shingles, but he was glad to see me any way. He said this is definitely erythema nodosum (yay for google!) and that he had only seen it a few times in his years as a dermatologist. Online it states he has been practicing for over 30 years...
