Dr. Cupoli reported photodistribution of viral exanthems (Pediatrics 59:484, March 1977) just as Gilchrest and Baden had done earlier.1 Their conclusions are obviously right, but I would like to remind the reader of another disease, swimmer's itch, which may occur like the exanthems Cupoli reported.2 The lesions in Figure 1 of Cupoli's report resemble very much real swimmer's itch (accompanying Figure). It is caused by a worm, cercaria ocellata, and is acquired by swimming in infected water.3