Erythema Migrans
Erythema migrans is the earliest and most characteristic clinical sign of Lyme disease, an infection caused by the bacterium Borrelia burgdorferi and transmitted by the bite of the black-legged tick (Ixodes). It is more than a simple skin reaction: it is an important signal that the bacteria are starting to spread through the body.
At Haute-Derma, we treat every suspected case of erythema migrans with a high level of vigilance. Recognizing the typical "bull's-eye" or target pattern early lets us start antibiotics promptly and stop the disease from progressing to later stages that can seriously damage the joints, heart and central nervous system.
Our Approach to Erythema Migrans
Our specialists at Haute-Derma pay close attention to how the lesion behaves over time:
- Bull's-eye pattern: a red patch spreads outward from the original bite, and its center may be paler or darker red, producing a series of concentric rings.
- Rate of spread: the lesion grows outward day by day and can reach anywhere from 5 cm to more than 30 cm across.
- How it feels: the skin often feels warm to the touch but is rarely painful or very itchy, which is why many people dismiss it.
We know that a red mark that "doesn't hurt or itch" is easily mistaken for an ordinary insect bite. At Haute-Derma, a careful history of where you have been and what you were exposed to is key to making sure Lyme disease is not missed.
How We Diagnose It at Haute-Derma
Haute-Derma follows a detailed diagnostic process to identify the underlying systemic cause:
- Clinical diagnosis: in endemic areas or when the rash looks typical, the diagnosis is usually made on the spot without waiting for blood tests, since antibodies often have not developed yet at this early stage.
- Exposure history: we ask about recent trips to forests, mountains or grasslands and any contact with wild animals.
- Serology: at later stages, Haute-Derma performs ELISA and Western blot testing for antibodies against Borrelia.
- Skin biopsy: may be recommended to rule out other figurate erythemas, such as erythema annulare centrifugum (EAC).
How Is It Treated at Haute-Derma?
Our treatment plan at Haute-Derma aims to clear the infection completely and prevent complications:
- Oral antibiotics: doxycycline, amoxicillin or cefuroxime, given according to standard guidelines for 10–21 days.
- Managing systemic symptoms: relief for any accompanying fever, fatigue or headache.
- Monitoring for complications: a follow-up plan to watch for joint and nerve symptoms after the antibiotic course ends.
- Prevention advice: how to check your body for ticks and deal with a tick bite to avoid reinfection in the future.
