Hello and welcome to the Zero Definals podcast. My name is Tom and in this episode I'm going to be talking to you about erythema,

nodosum. And you can find written notes on this topic at zero definals.com slash erythema nodosum

or in the dermatology section of the zero definals pediatrics book.

So let's get straight into it.

Erythema, nodosum, is a condition where red lumps appear on the patient's shins.

Erathema means red and nodosum directly translates from Latin as nots, referring to lumps.

It's caused by inflammation of the subcutaneous fat on the shins.

Inflammation of fat is called paniculitis.

It's caused by a hypersensitivity reaction.

In about half of patients there is no identifiable cause.

It's associated with a number of triggers and underlying conditions.

So let's go through those associations.

Erythemaidosum is caused by a hypersensitivity reaction and there's often an underlying identifiable cause.

And this may be a streptococcal throat infection,

gastroenteritis,

mycoplasma pneumonia,

tuberculosis,

pregnancy,

or medication such as the oral contraceptive pill.

It can also be associated with chronic diseases such as inflammatory bowel disease, sarcoidosis,

lymphoma and leukemia. Here's a tom tip for you. Erathema nodosum often indicates inflammatory

bowel disease or sarcoidosis in medical exams. And these are the two conditions to remember. So how does it

...