Annulus migrans is a dermatological term used to describe a characteristic skin rash that often accompanies certain parasitic infections, such as hookworm infestation and larva migrans. The term "annulus migrans" is derived from Latin, with "annulus" meaning ring and "migrans" referring to migrating or moving.
This skin condition is characterized by the appearance of a red, raised and serpiginous (snake-like) rash that exhibits a creeping or migrating pattern. The rash typically starts as a small, red papule or bump that expands outward in a circular or oval shape. It is often accompanied by intense itching, burning, or stinging sensations.
The distinct feature of annulus migrans is the gradual progression of the rash, with new lesions forming at the leading edge while older patches begin to fade away, hence the term "migrating ring." As the infection progresses, the rash can spread across various areas of the body, typically in the regions where the skin comes into contact with the causative agent, such as feet in the case of larva migrans.
The diagnosis of annulus migrans typically involves a physical examination, medical history assessment, and identification of the underlying cause through laboratory tests. Treatment usually involves addressing the underlying parasitic infection through appropriate antiparasitic medications, accompanied by symptomatic relief measures such as topical corticosteroids or antihistamines to alleviate itching and discomfort.
Prompt diagnosis and treatment are crucial to prevent complications and further spread of the infection. It is advisable to consult a healthcare professional if annulus migrans or any suspicious skin rash is observed to ensure accurate diagnosis and appropriate management.
