These results should alert dermatologists that similar levels of clinical severity in psoriasis may be associated with different levels of quality of life and psychological distress of patients. Particular attention should be devoted to older patients, and especially to older women.

Future studies using QoL as an instrument in research on patients with alopecia should consider that in cases of female alopecia these measurements may be affected by psychological disturbances.

The effects of acne vulgaris on quality of life and changes in quality of life after treatment are not only explainable by objective severity of acne. Patients' and clinicians' judgements about acne severity are different.

Our study validated Skindex symptom, Skindex function and SCI social subscales for QoL measurement during treatment with topical 5-FU. The study could not provide evidence for construct validity of the other subscales. Skindex was more responsive than SCI in the context of 5-FU treatment.