Summarize this article in one sentence.
You may experience itching before you even know you've been bitten. This is because the bite won't appear on your skin for a few hours. Scratching is often the first indication that you've suffered a bite. With chiggers, the worst itching occurs about 1-2 days after the bite. The welt could be flat or raised. Sometimes you may develop a pustule or blister, but this is not always the case. It's easy to mistake chigger bites for a rash or skin condition because they'll often appear in a cluster. However, this is normal with chigger bites, especially after spending extended time outdoors. Most chigger bites occur after you encounter a cluster of chigger larvae, which need to attach to a host. Unfortunately, humans make great hosts! These tiny pests are common in grassy areas or near waterways. They are most prevalent in late spring through early fall. Unfortunately, chiggers like to bite in the groin area because the skin is easier to bite. In some cases, this can cause "summer penile syndrome," which results in itching, swelling, and trouble peeing. Symptoms can last for a few days to a few weeks.

Summary:
Notice extreme itching. Look for a red welt that develops about 1-3 hours after the bite occurs. Look for a cluster of bites. Consider if you've spent time outdoors. Watch for swelling in your groin area.