Impetigo herpetiformis is a form of severe pustular psoriasis occurring in pregnancy which may occur during any trimester.It is the only well known pustular psoriasis which is treated with steroids. See also
Dermatoses of pregnancy
List of cutaneous conditions

Notes
References
Yap FBB (4 June 2008). "Impetigo herpetiformis: A case report and review of literature". Egyptian Dermatology Online Journal. 1 (4). ISSN 1687-3831. Retrieved 2009-07-09. == External links ==
Other coincident diseases such as heart problems, diabetes, or history of alcohol abuse are also related with shortened survival. While the earlier the age at onset the higher the total survival years, life expectancy is particularly reduced when compared to the healthy population among those who are younger. Men have a less favourable survival prognosis than women.Pneumonia and dehydration are the most frequent immediate causes of death brought by Alzheimers disease, while cancer is a less frequent cause of death than in the general population. Epidemiology
Two main measures are used in epidemiological studies: incidence and prevalence. Incidence is the number of new cases per unit of person-time at risk (usually number of new cases per thousand person-years); while prevalence is the total number of cases of the disease in the population at any given time. Regarding incidence, cohort longitudinal studies (studies where a disease-free population is followed over the years) provide rates between 10 and 15 per thousand person-years for all dementias and 5–8 for Alzheimers disease, which means that half of new dementia cases each year are Alzheimers disease. Advancing age is a primary risk factor for the disease and incidence rates are not equal for all ages: every 5 years after the age of 65, the risk of acquiring the disease approximately doubles, increasing from 3 to as much as 69 per thousand person years. Females with Alzheimers disease are more common than males, but this difference is likely due to womens longer life spans.