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Image of a long-lasting expanding Lyme rash: what does it show?

This photograph shows erythema migrans on a thigh approximately eight weeks after it first appeared.

Reviewed by VuxLore® Knowledge Team For People

Image of a long-lasting expanding Lyme rash: what does it show?

Short answer

This photograph shows erythema migrans on a thigh approximately eight weeks after it first appeared.

At a glance

A rights-cleared example showing how an erythema migrans rash may enlarge and change over time.

Key takeaways

• Erythema migrans may expand over days or weeks

• It may become more recognisable over time

• Do not delay advice while waiting for a rash to change

What does this expanding rash image show?

This clinical photograph shows erythema migrans on a thigh approximately eight weeks after initial presentation. The earlier rash looked less typical.

Does every Lyme rash develop this way?

No. Timing, colour, shape and visibility vary. Some never form a clear ring, and ordinary bite reactions can look similar.

If a rash is expanding after possible tick exposure, obtain appropriate medical advice promptly.

Sources and further reading

UK Lyme disease guidance and data

For current UK clinical advice, public-health guidance and surveillance data, consult these primary national sources.

  1. Lyme disease — NHS opens in a new tab ↗
  2. Lyme disease: diagnosis and management (NG95) — NICE opens in a new tab ↗
  3. Lyme disease: management and prevention — UKHSA opens in a new tab ↗
  4. Lyme disease surveillance dashboard — UKHSA opens in a new tab ↗
  5. Lyme disease — NHS Inform Scotland opens in a new tab ↗