Hello and welcome to HCM,Erythema nodosum
is inflammation of the fat cells.
The cause of inflammation is not known but it is known to occur secondary to many other factors like certain drugs and infections.
Since, fat cells are distributed all over the body erythema nodosum can occur at any part of the body.
A skin biopsy
along with deep tissue is required to make the final diagnosis.
These lesions disappear spontaneously.
However, there are many lesions which do not heal on their own.
In such cases drugs such as steroids
are required to control the inflammation.
Antibody test is not a confirmatory test for erythema nodosum.
It can be confirmed by biopsy only.
Consult your dermatologist
for further work up.
Thanks and take care
Dr Shailja P Wahal