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Exposure and symptoms

Infections, STIs, and safer sex

Symptoms, testing, condoms, and why examination or lab testing often matters more than guessing.

Evidence checked July 15, 2026 · Editorially reviewed, not clinician-reviewed
A fully clothed adult speaking privately with a nurse at a sexual-health testing clinic.
Educational illustration — not a diagnostic image
In 20 seconds

Discharge, burning, sores, rash, or pain can have sexually transmitted and non-sexually transmitted causes. Symptoms alone often cannot identify the cause, and many STIs have no symptoms.

01

What to know

  • Testing decisions depend on exposure sites, timing, symptoms, partners, and local guidance.
  • Condoms reduce risk when used correctly but do not eliminate every skin-to-skin infection risk.
  • Avoid sexual contact when you have unexplained sores, discharge, or a suspected infection until you have appropriate advice.
What people often get wrong

A similar-looking photo or one matching symptom cannot confirm a cause. Timing, change, examination, and sometimes testing matter.

02

Useful next steps

  • Contact a sexual-health clinic or healthcare professional for testing rather than relying on appearance.
  • Tell the clinician about oral, anal, and genital exposure sites so testing can match the exposure.

When to get care

Do not rely on guesswork when the pattern changes.

  • Seek prompt care for discharge, burning urination, a new genital sore, fever, or significant pain.
  • Immediate support is available after sexual assault; preserve your choices and safety first.
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03

What a clinician may ask

  1. When did you first notice it, and is it changing?
  2. Is there pain, discharge, bleeding, fever, urinary change, or loss of function?
  3. Were there recent medicines, illness, injury, sexual contact, products, or procedures?
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