A sun allergy rash is the skin condition that results due to a hypersensitivity to the hot rays of the sun. This reaction is also known as a Polymorphous Light Eruption (PMLE). The rash most commonly appears during the season of spring when the skin is still in the process of adapting to the change in temperature and heat. The rashes appear within hours after prolonged exposure to sunlight and is only limited to areas of the body which were left uncovered. The rash is self-limiting and gradually improves and eventually disappears once the skin has grown accustomed to the heat of the new season.
The doctor may suggest hospitalization simply because it may be necessary to break the cycle of chronic inflammation, or other problems that are exacerbating the illness. Frequently, five or six days of vigorous in-hospital treatment care can result in a dramatic clearing of the eczema. Food tests, allergy skin testing, and the development of an outpatient therapy plan can all be done during the hospitalization. Unfortunately, getting approval from insurers is often difficult. During an acute flare the number of 15-20 minute baths must be increased to three or four per day. Besides hydrating the skin, baths also increase the penetration of topical medication up to ten-fold if the medicine is applied immediately after the bath. Wet wraps after baths may also help hydration and medicinal penetration. Bedtime wet wraps are most practical, and can be done with elasticized gauze followed by ace bandages or double pajamas. (The first pair of pajamas is worn damp but not soaking wet, and a second pair of dry pajamas is worn over them. For a tighter fit, sometimes a plastic sauna suit is used instead of the dry pajamas.) For feet and hands, socks can be used. Additional blankets or increased room heat may be necessary during this three to seven days to prevent chilling.
Dosage requirements of corticosteroids vary among individuals and the diseases being treated. The usual starting dose range is 5 mg to 60 mg daily depending on the disease being treated. Doses are adjusted based on patient response. In general, the lowest possible effective dose is used. Corticosteroids given in multiple doses throughout the day are more effective, but also more toxic than alternate-day therapy where twice the daily dose is administered every other morning. Prednisolone should be taken with food to reduce irritation of the stomach and intestines.