The bites shown were caused by larvae of the sea anemone. These occur in salt water off coastal regions. Sea lice usually attach themselves to fish but clearly can bite humans. The above photograph is that of a young woman snorkeling off the coast of Mexico. The history she gives is extremely typical of sea lice. Shortly after snorkeling, she felt a sudden burning sensation underneath both breasts and felt a stinging sensation. No rash was evident until she returned home 2 days later. The typical eruptions are almost always under the bathing suit and appear as Sea Lice Closeuppapules or papulovesicles. These lesions can persist for 1 to 2 weeks. Treatment in the Outdoors If one suspect sea lice bites after diving or snorkeling, hydrogen peroxide or a quick soap and water scrub would be helpful. One must watch for a secondary skin infection. Healthcare Provider - Medical Treatment Without treatment, these lesions usually disappear in 1 to 2 weeks. However, most patients would appreciate getting rid of this as soon as possible. Topical or systemic corticosteroids provide relief and topical antibiotic ointment may be beneficial to impede secondary infection.