Threadworms in the face: what to know

Threadworm eggs can be transferred by contaminated fingers, bedding or surfaces, but the adult worms usually live in the intestine and lay eggs around the anus at night. A facial rash, itching, spot or moving mark therefore has many possible explanations and is not enough to identify threadworms. Look for the more typical pattern: night-time anal itching, disturbed sleep or fine white worms around the anus. Do not put worm medicine, disinfectant or other products on facial skin unless a clinician specifically advises it.

Wash hands with soap and water, keep fingernails short and launder towels and bedding if threadworms are suspected elsewhere in the household. Arrange advice from a pharmacist or GP before taking treatment, particularly for a child, pregnancy or breastfeeding. Photographing a changing skin finding in good light can help a clinician, but avoid squeezing, scraping or trying to remove it. Use only gentle skin care until the cause is clearer.

Seek urgent care for facial swelling affecting the lips, tongue or eyes, trouble breathing, rapidly spreading redness, severe pain, fever with an unwell appearance, or a painful eye. Arrange a GP consultation for a persistent facial rash, a suspected foreign body, night-time anal itching, or symptoms that do not improve with appropriate advice. Abdominal pain or bedwetting should be assessed on its own merits rather than used to diagnose a facial problem.

Ask what the facial finding resembles, whether the anus or household contacts should be checked for threadworms, and which treatments are safe for the person's age and skin. Mention when it began, whether it moves, associated itching, fever, new products and any treatment already tried.