| Infants and children | Adolescents | |
| Systemic illnesses | Stevens-Johnson syndrome Behçet syndrome Reactive arthritis (formerly Reiter syndrome) Varicella | Stevens-Johnson syndrome Behçet syndrome Reactive arthritis (formerly Reiter syndrome) |
| Genitourinary infections | Pyelonephritis Cystitis (viral or bacterial) Vaginitis Urethritis Balanitis/balanoposthitis Genital herpes | Pyelonephritis Pelvic inflammatory disease Cystitis (viral or bacterial) Cervicitis Vaginitis Urethritis Balanitis/balanoposthitis Genital herpes |
| Other genital conditions | Nonspecific (chemical) urethritis Urethral stricture Virginal vaginal ulcers Labial adhesions Lichen sclerosis Local trauma (eg, sexual abuse, masturbation) Diaper dermatitis (infants) | Nonspecific (chemical) urethritis Urethral stricture Virginal vaginal ulcers Local trauma (eg, sexual activity, masturbation) |
| Miscellaneous | Urinary stones Psychogenic urethritis Idiopathic hypercalciuria Sexual abuse Chemical irritation Dysfunctional elimination Eosinophilic cystitis | Urinary stones Psychogenic urethritis Idiopathic hypercalciuria Eosinophilic cystitis |
| Related entities | Pinworms |
