Knotty erythema is a dermatological inflammation, characterized by the appearance of painful lumps under the skin, approximately 1 to 5 cm, which have a reddish color and are usually located at the bottom of the legs and arms.
However, there may be other symptoms such as:
- This change can affect people of all ages.
- Being more common between the ages of 15 and 30; symptoms usually go away in 3 to 6 weeks.
- But in some people they can last longer.
- For up to 1 year.
Knotted erythema is a type of paniculitis and is considered a symptom of certain diseases, such as leprosy, tuberculosis, and ulcerative colitis, but it can also be caused by an allergic reaction to certain medications.
Diagnosis can be made by a dermatologist by an evaluation of the person’s symptoms and a physical exam, and confirmed by a biopsy of a nodule.
Treatment is then performed based on the cause of knotty erythema, as well as the use of anti-inflammatory drugs and rest to relieve symptoms. Find out how the treatment of knotty erythema is going.
Inflammation that causes knotty erythema occurs due to immune reactions in the body, caused by:
However, there are people in which the cause cannot be found, calling themselves, in these cases, an idiopathic nodular rash.