Why didn't the skin redden when I first used phototherapy with a UVB lamp?
The first irradiations are test and the time is short, in order to find out how many minutes our skin can tolerate until the desired condition occurs, which is the subtle redness of vitiligo. If this condition does not occur even after 4 minutes, either you have the lamp too far from the skin or you have not removed the protective film.
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