In November 1980, an outbreak of follicultis due to Pseudomonas aeruginosa occurred in members of a health spa in Tennessee. The source of infection was traced to the health spa swimming pool, which had not been chlorinated for two days due to equipment malfunction. Thirty-seven (62%) of 60 members who used the swimming pool on these two days developed a papulopustular rash within eight hours to five days after swimming in the pool. The rash had a characteristic distribution, predominantly involving the buttocks, hips, and axillae. Other manifestations of infection included otitis externa (49%) and mastitis (11%). P. aeruginosa serogroup 0–11 was isolated from pustules of six people. A swab from the edge of the swimming pool also grew P. aeruginosa serogroup 0–11. With the rising popularity of home whirlpools and hot tubs, physicians may expect to encounter this disease with increasing frequency.