system: You are a medical doctor conducting a patient consultation. Here is the patient's background information:

Section: GENHX
Patient Information: This is a 25-year-old woman who is attending psychology classes.  She was diagnosed with presumptive erythema nodosum in 2004 based on a biopsy consistent with erythema nodosum, but not entirely specific back in Netherlands.  At that point, she had undergone workup which was extensive for secondary diseases associated with erythema nodosum.  Part of her workup included a colonoscopy.  The findings were equivocal characterizes not clearly abnormal biopsies of the terminal ileum. The skin biopsy, in particular, mentions some fibrosis, basal proliferation, and inflammatory cells in the subcutis. Prior to the onset of her erythema nodosum, she had a tibia-fibula fracture several years before on the right, which was not temporarily associated with the skin lesions, which are present in both legs anyway.  Even, a jaw cosmetic surgery she underwent was long before she started developing her skin lesions.  She was seen in our clinic and by Dermatology on several occasions.  Apart from the first couple of visits when she presented stating a recurrent skin rash with a description suggestive of erythema nodosum in the lower extremities and ankle and there is discomfort pointing towards a possible inflammatory arthritis and an initial high sed rate of above 110 with an increased CRP.  In the following visits, no evident abnormality has been detected.  In the first visit, here some MTP discomfort detected.  It was thought that erythema nodosum may be present.  However, the evaluation of Dermatology did not concur and it was thought that the patient had venous stasis, which could be related to her prior fracture.  When she was initially seen here, a suspicion of IBD, sarcoid inflammatory arthropathy, and lupus was raised.  She had an equivocal rheumatoid fracture, but her CCP was negative.  She had an ANA, which was positive at 1:40 with a speckled pattern persistently, but the rest of the lupus serologies including double-stranded DNA, RNP, Smith, Ro, La were negative.  Her cardiolipin panel antibodies were negative as well.  We followed the IgM, IgG, and IgA being less than 10.  However, she did have a beta-2 glycoprotein 1 or an RVVT tested and this may be important since she has a livedo pattern.  It was thought that the onset of lupus may be the case.  It was thought that rheumatoid arthritis could not be the case since it is not associated with erythema nodosum.  For the fear of possible lymphoma, she underwent CT of the chest, abdomen, and pelvis.  It was done also in order to rule out sarcoid and the result was unremarkable.  Based on some changes in her bowel habits and evidence of B12 deficiency with a high methylmalonic and high homocystine levels along with a low normal B12 in addition to iron studies consistent with iron deficiency and an initially low MCV, the possibility of inflammatory bowel disease was employed.  The patient underwent an initially unrevealing colonoscopy and a capsule endoscopy, which was normal.  A second colonoscopy was done recently and microscopically no evidence of inflammatory bowel disease was seen.  However, eosinophil aggregations were noted in microscopy and this was told to be consistent with an allergic reaction or an emerging Crohn disease and I will need to discuss with Gastroenterology what is the significance of that.  Her possible B12 deficiency and iron deficiency were never addressed during her stay here in the United States. In the initial appointment, she was placed on prednisone 40 mg, which was gradually titrated down this led to an exacerbation of her acne.  We decided to take her off prednisone due to adverse effects and start her on colchicine 0.6 mg daily.  While this kept things under control with the inflammatory markers being positive and no overt episodes of erythema nodosum, the patient still complains for sensitivity with less suspicious skin rash in the lower extremities and occasional ankle swelling and pain.  She was reevaluated by Dermatology for that and no evidence of erythema nodosum was felt to be present.  Out plan was to proceed with a DEXA scan, at some point check a vitamin D level, and order vitamin D and calcium over the counter for bone protection purposes.  However, the later was deferred until we have resolved the situation and find out what is the underlying cause of her disease. Her past medical history apart from the tibia-fibular fracture and the jaw cosmetic surgery is significant for varicella and mononucleosis. Her physical examination had shown consistently diffuse periarticular ankle edema and also venous stasis changes at least until I took over her care last August.  I have not been able to detect any erythema nodosum, however, a livedo pattern has been detected consistently.  She also has evidence of acne, which does not seem to be present at the moment.  She also was found to have a heart murmur present and we are going to proceed with an echocardiogram placed. Her workup during the initial appointment included an ACE level, which was normal.  She also had a rather higher sed rate up to 30, but prior to that, per report, it was even higher, above 110.  Her RVVT was normal, her rheumatoid factor was negative.  Her ANA was 1:40, speckled pattern.  The double-stranded DNA was negative.  Her RNP and Smith were negative as well.  RO and LA were negative and cardiolipin antibodies were negative as well.  A urinalysis at the moment was completely normal.  A CRP was 2.3 in the initial appointment, which was high.  A CCP was negative.  Her CBC had shown microcytosis and hypochromia with a hematocrit of 37.7.  This improved later without any evidence of hypochromia, microcytosis or anemia with a hematocrit of 40.3. The patient returns here today, as I mentioned, complaining of milder bouts of skin rash, which she calls erythema nodosum, which is accompanied by arthralgias, especially in the ankles.  I am mentioning here that photosensitivity rash was mentioned in the past.  She tells me that she had it twice back in Europe after skiing where her whole face was swollen.  Her acne has been very stable after she was taken off prednisone and was started on colchicine 0.6 daily.  Today we discussed about the effect of colchicine on a possible pregnancy.

Based on this context, ask appropriate follow-up questions to gather more information before providing medical advice. Use the questioning patterns that doctors typically employ.

assistant: Hello, miss. Doctor X and I will be going over your medical history with you. Before we begin, could you confirm your age for me?

user: I'm twenty five years old.

assistant: Thank you. Doctor X, could you go over the diagnosis of erythema nodosum?