Pyoderma gangrenosum associated with acne conglobata.

We report a 16-year-old male in whom pyoderma gangrenosum appeared in conjunction with acne conglobata. The patient also developed a seronegative spondyloarthropathy that was the main presenting complaint. There was no evidence of inflammatory bowel disease. Treatment with isotretinoin was successful. Both acne and pyoderma lesions healed and the articular symptoms improved. The present case, together with other reports in the literature show that acne conglobata must be included in the list of possible associations of pyoderma gangrenosum. We also comment on acne arthritis, a relatively frequent phenomenon, although still not generally known, in acne conglobata.