What is Romaña's Sign in Acute Chagas Disease?

Romaña’s sign is a distinct, painless swelling of the eyelid on one side of the face. It occurs during the acute phase of American trypanosomiasis (Chagas disease) when the parasite Trypanosoma cruzi enters the body through the mucous membranes of the eye ^[1]. While it is one of the most recognized visual markers of a Chagas infection, it is only present in a minority of people who become infected ^[2].

Early Signs of Infection: The “Port of Entry”

Chagas disease is primarily spread by the kissing bug (triatomine bug), a nocturnal insect that often bites people around the face while they are sleeping. When the bug bites, it leaves behind feces containing the parasite. The infection can enter the body if a person accidentally rubs the feces into a break in their skin or into their eye.

Depending on where the parasite enters, the body may create an inflammatory reaction right at that spot:

• Romaña’s Sign: If the parasite enters through the conjunctiva (the clear membrane covering the eye), it can cause a localized reaction resulting in swelling of the upper and lower eyelid on one side of the face ^[1]. This swelling is typically painless ^[2].
• Chagoma: If the parasite enters through a break in the skin, a small, hard, red, and usually painless nodule may develop at the bite site ^[3]. This is called an inoculation chagoma.

Both Romaña’s sign and chagomas are classic signs of the acute phase of Chagas disease ^[2][4].

When Do They Appear and How Long Do They Last?

These signs generally appear shortly after infection. The incubation period for vector-borne Chagas disease (from a bug bite) is typically one to two weeks ^[3]. If a chagoma or Romaña’s sign develops, it usually becomes visible during this initial period of the acute phase ^[3].

While these physical signs can be alarming, they are temporary. The swelling and nodules are transient features of the acute phase that will eventually resolve on their own as the disease progresses to the next stage ^[2]. However, the disappearance of the swelling does not mean the infection is gone.

Are They Always Present?

No. While they are clear visual indicators that an infection has occurred, they are absent in most patients.

• A minority of cases: Many people who contract Chagas disease never develop a chagoma or Romaña’s sign ^[2].
• Different transmission routes: These signs are specifically associated with vector-borne transmission (a bug bite). If the infection is acquired through eating contaminated food or drink (oral transmission), a person will not develop a chagoma or Romaña’s sign ^[5][6].

Accompanying Symptoms

If a person develops Romaña’s sign or a chagoma, they may also experience other non-specific symptoms of acute Chagas disease. These can include:

• Fever ^[1]
• Swollen lymph nodes (lymphadenopathy) ^[1]
• Enlargement of the liver and spleen (hepatosplenomegaly) ^[1]

What to Do Next

Because these early signs can sometimes be mistaken for a common eye infection (like orbital cellulitis) or a skin infection, knowing your exposure history is vital for an accurate diagnosis ^[2]. This includes remembering a possible bug bite or recent travel to areas where Chagas disease is common, such as Latin America or parts of the southern United States.

If you suspect you have Romaña’s sign or a chagoma, it is important to seek prompt medical evaluation. The acute phase of Chagas disease is highly treatable, and standard antiparasitic medications are considered very effective at reducing the parasite load during this early stage of the infection ^[7][8].