The Greenwich Department of Health has warned the public about cases of a skin rash known as “swimmers itch” occurring at several beaches.

The condition, also known as cercarial dermatitis, is caused by “an allergic reaction to microscopic parasites that are released from snails into fresh and saltwater."

The department says the condition is found throughout the world and usually surfaces during the summer months.

Symptoms of swimmer’s itch include tingling, burning or itching of the skin, small reddish pimples and small blisters that form within a short period of time.

The department urges residents to pay attention to signs that note reports of swimmer’s itch at recreational swimming areas.

“Using topical Benadryl, perhaps alternating with topical 1% hydrocortisone for symptom relief and really watching and waiting,” says Dr. Howard Selinger, with the School of Medicine at Quinnipiac University.

Health officials say you can cut the chances of getting swimmers itch by taking a shower and toweling off.