1) Erythema Nodusom
A very popular question in MRCP Part 2 as well as in MRCP PACES skin station, described as " tender erythematous nodular lesion usually on the anterior lower limbs".
Common causes of this skin lesion,
NO cause is found in 60% of cases
D rug (iodides, bromides, sulfonamides)
O ral contraceptives
S arcoidosis or Löfgren's syndrome
U lcerative colitis, Crohn's disease, Behçet's syndrome
M icrobiology: any chronic infection (bacterial, viral, yersinia, tuberculosis, leprosy, deep fungal)
Source: Postgraduate medicine, click here !
Common question in MRCP is about Erythema nodusom with sarcoidosis!
2) Erythema multiforme
It is described as 'target lesion'. Not involving mucous membrane.
Common causes ( only two major causes)
-Drugs- common drugs asked in MRCP- pheytoin, allupurinol, carbamazepine. To find other possible drugs, click here !
-infections- commonly associated with herpes, staphylococcus and mycoplasma.
3) Dermatitis Herpetiformis 
It is described as ' chronic itchy rash consisting of blisters'.
It is associated with gluten sensitivity and Coeliac disease. Know about the treatment and foods contain gluten. To learn more, click here !
To be continued..................
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